Why African Rhinos Are Facing a Crisis

The body count for African rhinos killed for their horns is approaching crisis proportions, according to the latest figures released by the International Union for Conservation of Nature (IUCN).

To National Geographic reporter Peter Gwin, the dire numbers—a rhinoceros slain every 11 minutes since the beginning of 2013—don't come as a surprise. "The killing will continue as long as criminal gangs know they can expect high profits for selling horns to Asian buyers," said Gwin, who wrote about the violent and illegal trade in rhino horn in the March 2012 issue of the magazine.

The recent surge in poaching has been fueled by a thriving market in Vietnam and China for rhino horn, used as a traditional medicine believed to cure everything from hangovers to cancer. Since 2011, at least 1,700 rhinos, or 7 percent of the total population, have been killed and their horns hacked off, according to the IUCN. More than two-thirds of the casualties occurred in South Africa, home to 73 percent of the world's wild rhinos. In Africa there are currently 5,055 black rhinos, listed as critically endangered by the IUCN, and 20,405 white rhinos. (From our blog: "South African Rhino Poaching Hits New High.")

Trying to snuff out poaching by itself won't work, said Gwin. The South African government is fighting a losing battle on the ground to gangs using helicopters, dart guns, high-powered weapons—and lots of money. (National Geographic pictures: The bloody poaching battle over rhino horn [contains graphic images].)

"Every year they get tougher on poaching, but rhino killings continue to rise astronomically," said Gwin. "Somehow they have to address the demand side in a meaningful way. This means either shutting down the Asian markets for rhino horn, or controversially, finding a way to sustainably harvest rhino horns, control their legal sale, and meet what appears to be a huge demand. Either will be a formidable endeavor."

Hope and Hurdles

The signing in December of a memorandum of understanding between South Africa and Vietnam to deal with rhino poaching and other conservation issues raises hope for some concrete action. Observers say the next step is for the two governments to follow through with tangible crime-stopping efforts such as intelligence sharing and other collaboration. The highest hurdle to stopping criminal trade, though, is cultural, Gwin believes. "In Vietnam and China, a lot of people simply believe that as a traditional cure, rhino horn works." (Related: "Blood Ivory.")

The recent climb in rhino deaths threatens what had been a conservation success story. Since 1995, due to better law enforcement, monitoring, and other actions, the overall rhino numbers have steadily risen. The poaching epidemic, the IUCN warns, could dramatically slow and possibly reverse population gains.

The population growth is also being stymied by South Africa's private game farmers, who breed rhinos for sport hunting and tourism and for many years have helped rebuild rhino numbers. Many of them are getting out of the business due to the high costs of security and other risks associated with the poaching invasions.

Those who still have rhinos on their farms will often pay a veterinarian to cut the horns off—under government supervision—to dissuade poachers, but the process costs more than $2,000 and has to be repeated when the horns grow back every two years. Even then the farmers are stuck with horns that are illegal to sell—and which criminals seek to obtain.

Room for Debate

Rhino killings and the trade in their horns will be a major topic at a high-profile conference, the 16th meeting of the Conference of the Parties to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), which opens in Bangkok March 3. What won't surprise Gwin is if the issue of sustainably harvesting rhino horns from live animals comes up for discussion.

"It's an idea that seems to be gaining traction among some South African politicians and law enforcement circles," he said, noting that the international conservation community strongly opposes any talk of legalizing the trade of rhino horn, sustainably harvested or not. The bottom line for all parties in the discussion is clear, said Gwin: "The slaughter has to stop if rhinos are to survive."

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Arias Prosecutor Too Combative, Experts Say

He has barked, yelled, been sarcastic and demanded answers from accused murderer Jodi Arias this week.

And in doing so, prosecutor Juan Martinez and his aggressive antics may be turning off the jury he is hoping to convince that Arias killed her ex-boyfriend Travis Alexander in June 2008, experts told ABCNews.com today.

"Martinez is his own worst enemy," Mel McDonald, a prominent Phoenix defense attorney and former judge, told ABC News. "He takes it to the point where it's ad nauseam. You have difficulty recognizing when he's driving the point home because he's always angry and pushy and pacing around the courtroom. He loses the effectiveness, rather than build it up."

"He's like a rabid dog and believes you've got to go to everybody's throat," he said.

"If they convict her and give her death, they do it in spite of Juan, not because of him," McDonald added.

Martinez's needling style was on display again today as he pestered Arias to admit that she willingly participated in kinky sex with Alexander, though she previously testified that she only succumbed to his erotic fantasies to please him.

Arias, now 32, and Alexander, who was 27 at the time of his death, dated for a year and continued to sleep together for another year following their break-up.

Arias drove to his house in Mesa, Ariz., in June 2008, had sex with him, they took nude photos together and she killed him in his shower. She claims it was in self-defense. If convicted, Arias could face the death penalty.

Jodi Arias, Prosecutor Butt Heads in Cross-Examination Watch Video

Jodi Arias Maintains She 'Felt Like a Prostitute' Watch Video

Jodi Arias Admits to Killing Man, Lying to Police Watch Video

Martinez also attempted to point out inconsistencies in her story of the killing, bickering with her over details about her journey from Yreka, Calif., to Mesa, Ariz., including why she borrowed gas cans from an ex-boyfriend, when she allegedly took naps and got lost while driving, and why she spontaneously decided to visit Alexander at his home in Mesa for a sexual liaison.

"I want to know what you're talking about," Arias said to Martinez at one point.

"No, I'm asking you," he yelled.

Later, he bellowed, "Am I asking you if you're telling the truth?"

"I don't know," Arias said, firing back at him. "Are you?"

During three days of cross examining Arias this week, Martinez has spent hours going back and forth with the defendant over word choice, her memory, and her answers to his questions.

"Everyone who takes witness stand for defense is an enemy," McDonald said. "He prides himself on being able to work by rarely referring to his notes, but what he's giving up in that is that there's so much time he wastes on stupid comments. A lot of what I've heard is utterly objectionable."

Martinez's behavior has spurred frequent objections of "witness badgering" from Arias' attorney Kirk Nurmi, who at one point Tuesday stood up in court and appealed to the judge to have a conference with all of the attorneys before questioning continued. Judge Sherry Stephens at one point admonished Martinez and Arias for speaking over one another.

Andy Hill, a former spokesperson for the Phoenix police department, and Steven Pitt, a forensic psychiatrist who has testified as an expert witness at many trials in the Phoenix area, both said that despite his aggressive style, Martinez would likely succeed in obtaining a guilty verdict.

"When it comes to cross examination, one size does not fit all," said Pitt. "But if you set aside the incessant sparring, what the prosecutor I believe is effectively doing is pointing out the various inconsistencies in the defendant's version of events."

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McCain, Graham say Obama understands border security’s link to immigration reform

President Obama understands Republican concerns about the need to link improved border security to changes in immigration law, two key Republicans involved in the effort said Tuesday after a White House meeting with Obama.

Sens. John McCain (Ariz.) and Lindsey O. Graham (S.C.) said they covered a variety of topics in the unusual meeting with Obama, including a robust discussion of how to reshape the nation’s immigration laws.

The GOP duo — members of a bipartisan group of eight senators working to write an immigration bill for introduction in March — emerged with strong praise for Obama’s leadership and optimism for the fate of the effort.

“It was one of the best meetings I’ve ever had with the president,” Graham said. “I think the president’s very sincere in wanting a bill and wanted to know what he could do to help.”

According to a joint statement of principles issued by the Senate group last month, illegal immigrants would be able to quickly seek temporary legal status after passage of possible legislation. But they would not be able to seek permanent residency until the border is more secure.

Republicans have said the linkage is key to a bipartisan agreement, although it worries immigrant advocates. Obama has presided over a record number of deportations during his time in office.

McCain and Graham said after Tuesday’s meeting that they believe Obama understands GOP concerns about the border.

“He understands that we need border security that we can afford,” Graham said. “Sen. McCain made a strong point about the border. The president understands the working components of it.”

White House officials did not respond to requests for comment.

The meeting represented an unusual outreach from Obama to rank-and-file Republicans. It grew out of phone calls Obama placed to the two senators last week, along with a call to Sen. Marco Rubio (R-Fla.).

Some Republicans had said they doubted the president’s commitment to a bipartisan process after the draft of a separate White House bill was leaked to the press. Obama has said the bill is merely a fallback in case the Senate talks falter.

The White House meeting could be an attempt to quiet criticism from the Hill, where lawmakers in both parties have long griped that they rarely hear from the president.

McCain and Graham have also been warning publicly about the impact on national defense of allowing $85 billion in spending cuts to take effect Friday. Neither would say Tuesday whether they discussed the looming sequester with Obama.

David Nakamura contributed to this report.

Discuss this topic and other political issues in the politics discussion forums.

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Safety concerns cloud S. Korea nuclear drive

GORI, South Korea: South Korea has big plans to become a major nuclear energy player, but they are unfolding at a time when the global industry is under intense scrutiny after the 2011 Fukushima disaster.

And its ambitions have not been helped by a series of domestic scandals and forced reactor shutdowns in 2012 that rattled public confidence and exposed a glaring lack of regulatory transparency.

Around US$400 billion is riding on South Korea's ability to sell its technology to potential clients as it aims to take on the United States, France and Russia and grab a 20 percent share of the nuclear energy market.

With around half of the world's 430 reactors due for retirement by 2030, according to the International Atomic Energy Agency, the next 15 years or so offer the prospect of a sales bonanza.

Spearheading South Korea's global drive is its ARP-1400 reactor. It won a $20 billion deal in 2009 to build four of them in the United Arab Emirates and it aims to export another 80, worth around US$400 billion, by 2030.

It is also planning a domestic energy expansion that would see it build 16 new reactors by 2030. South Korea currently operates 23 nuclear power reactors which meet more than 35 percent of the country's electricity needs.

"Our reactors are safe," Lee Young-Il insisted as he guided a group around an ARP-1400 nearing completion at the Gori nuclear power complex.

"We also have an excellent record of operating the reactors with a comparatively low annual rate of forced outage," said Lee, who heads the complex where South Korea's first commercial reactor came on line in 1978.

But the Fukushima disaster in Japan forced a number of countries to rethink their energy strategy, as public concern placed an even greater emphasis than before on reactor safety.

A survey commissioned by the Economics Ministry and published in November showed only 35 percent of South Koreans considered nuclear power to be safe, sharply down from 71 percent in January 2010.

"You are never free from worry as long as your country depends heavily on nuclear energy," Yangyi Won-Young, head of Nuclear-Free Korea, a coalition of civic groups, told AFP.

"Our nuclear power plants are vulnerable to natural disasters because of lax safety regulations which have been applied to construction, operation and parts," Yangyi said.

In the wake of the earthquake and tsunami-triggered meltdown at the Fukushima Daiichi nuclear plant in Japan, the state-run Korea Hydro and Nuclear Power Co (KHNP) launched a US$1.0 billion-dollar safety upgrade due to be completed by 2015.

The project involves building higher seawalls around the country's four nuclear power complexes, and equipping plants and reactors -- including the ARP-1400 -- with advanced watertight doors and ventilation systems, as well as new quake sensors.

But the upgrade coincided with a series of shutdowns and scandals in 2012 that triggered a warning from the International Energy Agency (IEA) in November about the need to rebuild public trust.

In May, five senior KHNP engineers were charged with trying to cover up a potentially dangerous power failure at the country's oldest Gori-1 reactor.

Later in the year, the government shut down two reactors at the Yeonggwang nuclear complex to replace components provided with fake quality certificates.

And a third reactor was taken offline at Yeonggwang when cracks were found on control rod tubes during maintenance work.

"Recent incidents at Korean nuclear facilities should serve as a timely reminder to the government that the nuclear regulatory authority must maintain an enhanced profile... and be able to take independent decisions," the IEA said in a report on South Korea's energy policies.

The South has been criticised in the past for a lack of transparency in the nuclear sector -- largely attributed to the regulatory bodies' mixed supervisory and promotional roles.

President Park Geun-Hye, who took office this week, looks set to further muddy the waters with her proposal for the nominally independent Nuclear Safety and Security Commission.

Park wants to affiliate the commission with a newly created super-ministry in charge of policies on science research, information communication technology and atomic energy development.

Scientists, environmentalists and a number of politicians -- including some from Park's ruling party -- say the move would undermine the watchdog's independence and weaken its safety management authority.

"The Republic of Korea is going to be the only country across the globe where regulators and basically developers or promoters might be working all together under the same roof," said Suh Kune-Yull, a nuclear engineering professor at Seoul National University.

"A conflict of interest is inevitable," Suh said.

- AFP/fl

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Arms dealer with huge weapons arrested in Imphal

IMPHAL: An arms dealer was arrested after a large number of weapons were allegedly found in his possession during a massive search operation in Imphal east district of Manipur.

Superintendent of police (Imphal east district) Kamei Angam said following a tip-off, a police team led by officer in charge of district commandos inspector Achouba Meitei searched Shingjamei Bheigyabati Leikai area near here on Tuesday.

During the operation, an arms dealer identified as Khetrimayum Umakanta (44) was arrested. A single barrel country-made rifle, two country-made pistols, one country-made air pistol and large number of ammunition were recovered from his possession.

Angam said Umakanta allegedly manufactured the country-made weapons. He is in police custody for further interrogation.

In another incident, Imphal east district police commandos on Tuesday arrested three militants of Kangleipak Communist Party ( military task force) during search operation at Wangkhei Ayang Palli area in the district, police said.

Sources identified the militants as N Gogonbihari (25), L Bobi (35) and LisamAbung (21). Two mobile phones, party's extortion letters and some other underground materials were recovered from them.

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A History of Balloon Crashes

A hot-air balloon exploded in Egypt yesterday as it carried 19 people over ancient ruins near Luxor. The cause is believed to be a torn gas hose. In Egypt as in many other countries, balloon rides are a popular way to sightsee. (Read about unmanned flight in National Geographic magazine.)

The sport of hot-air ballooning dates to 1783, when a French balloon took to the skies with a sheep, a rooster, and a duck. Apparently, they landed safely. But throughout the history of the sport, there have been tragedies like the one in Egypt. (See pictures of personal-flight technology.)

1785: Pioneering balloonist Jean-Francois Pilatre de Rozier and pilot Pierre Romain died when their balloon caught fire, possibly from a stray spark, and crashed during an attempt to cross the English Channel. They were the first to die in a balloon crash.

1923: Five balloonists participating in the Gordon Bennett Cup, a multi-day race that dates to 1906, were killed when lightning struck their balloons.

1924: Meteorologist C. LeRoy Meisinger and U.S. Army balloonist James T. Neely died after a lightning strike. They had set off from Scott Field in Illinois during a storm to study air pressure. Popular Mechanics dubbed them "martyrs of science."

1995: Tragedy strikes the Gordon Bennett Cup again. Belarusian forces shot down one of three balloons that drifted into their airspace from Poland. The two Americans on board died. The other balloonists were detained and fined for entering Belarus without a visa. (Read about modern explorers who take to the skies.)

1989: Two hot air balloons collided during a sightseeing trip near Alice Springs, Australia. One balloon crashed to the ground killing all 13 people on board. The pilot of the other balloon was sentenced to a two-year prison term for "committing a dangerous act." Until today, this was considered the most deadly balloon accident.

2012: A balloon hit a power line and caught fire in New Zealand, killing all 11 on board. Investigators later determined that the pilot was not licensed to fly and had not taken  proper safety measures during the crash, like triggering the balloon's parachute and deflation system.

2012: A sightseeing balloon carrying 32 people crashed and caught fire during a thunderstorm in the Ljubljana Marshes in Slovenia. Six died; many other passengers were injured.

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Inside Organized Retail Crime Raids

We used to call it shoplifting, but these days the foot soldiers of retail crime rings are known as boosters. Police even have an acronym for these operations: ORC, which stands for Organized Retail Crime.

"It's just like a Fortune 500 company," said Sergeant Eric Lee of the Gardena Police Department in Gardena, Calif. "All of this is just organized."

Watch the full story on "Nightline" TONIGHT at 12:35 a.m. ET

Police say big retail stores, from Walgreens to J.C. Penny, are getting hit by highly sophisticated shoplifting networks that steal and resell everything from underwear to razors to milk. According to the National Retail Federation, theft can amount to annual losses as high as a $37 billion for retail businesses.

"Every store in every city has to go through this," Lee said. "They wait until no one's paying attention and they walk out."

Tide detergent is currently a hot target because it is compact, expensive and easy to sell on the streets for profit, police said. The Street name: "liquid gold."

"Sometimes we get rings that just do alcohol," Lee said. "And then we get some that do just meat and seafood."

Investigators say boosters move the loot for cents on the dollar to fencing operations -- the black market resellers of the stolen goods -- which sell the stolen merchandise in plain sight in stores. Boosters, fencers, Mr. Bigs, all of those involved in these shoplifting operations can potentially make millions a year from boosting and re-selling stolen goods.

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And Mike Swett is on the case. A former Riverside County sheriff's deputy in Los Angeles, Swett was badly injured in a car wreck and now works as a full-time private investigator on the ORC beat who has worked with Target, Marshalls, T.J. Maxx. Stores hire him to do his own undercover police work, catching thieves before involving local law enforcement.

"Kind of like working a narcotics case, it's like you've got low-level, mid-level and then top dog," Swett said. "We like to go after the top dog and the only way to get to the top dog is mid-level first."

At his command center -- his apartment -- Swett showed off the boxes upon boxes of tapes and photographs he has collected, the fruits of countless silent stake-out hours.

Swett said he has been casing two joints in L.A. for months, both alleged to be mid-level fencing operations. "Nightline" was invited to ride along with him when he sent undercover agents in for a final reconnaissance mission.

At some stores and shopping malls, clerks do little to stop shoplifters and often let them run, which has contributed to the growing fencing operations.

"[The stores] don't want their employees to get injured," Swett said. "So oftentimes they will call the police, but by the time we get there they are already in their car and they are gone."

This leaves professional investigators like Swett to put the pieces together and bust open the gangs to lead over-stretched police departments to the prey.

When raid day arrived, a motorcade of squad cars departed from the Gardena, Calif., police department and pulled up to one fencing operation. Swett said the merchandise being sold was boosted goods.

"There is Victoria's Secret, expensive Victoria's Secret, the gift sets," he said, pointing down a line of tables. "J.C. Penny, Miramax, its real stuff not counterfeit."

He spotted a bottle of Katy Perry brand perfume, which usually retails for around $90 but one seller had it priced at $59.

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Sequestration doesn’t fly

Forget threats of furloughed workers or reduced security at embassies.

Here’s what might be the most powerful incentive yet for members of Congress to come up with a deal to avert the sequester: The head of the Air Force warned Monday that the spending cuts that will go into effect March 1 could cause the military to eliminate those lovely miljet flights that lawmakers enjoy.

Members of Congress adore flying on Air Force jets, particularly for overseas trips — there are no security lines, check-in is a breeze, the service couldn’t be better, and all seats are business-class.

But if the government-wide cuts aren’t thwarted and the military has to pinch pennies, lawmakers might have to kiss those perks goodbye, Air Force Secretary Michael Donley told the crowd at the Air Force Association’s winter conference in Orlando, according to a transcript. They might have to nix “interagency and congressional senior leader travel,” he warned.

Lawmakers flying commercial? The horror.

And if members of Congress are forced into such dire circumstances, they’re in for even more delays. Transportation Secretary Ray LaHood
cautioned Friday that the sequester could cause major backups in airports around the country.

So much for all those fact-finding trips.

The House divided?

It may not have snagged the Oscar for best picture, but the movie “Lincoln” is still a smash hit in official Washington.

LaHood suggested last week that the flick about the 16th president could offer a template for averting the sequester.

“Go and see ‘Lincoln,’ ” the transportation secretary advised Republicans during an appearance at a White House press briefing during which he outlined the impact of the budget cuts (think airport delays, angry passengers calling lawmakers, etc.).

He indicated that congressional negotiators should learn from Honest Abe, who “gathered people around him” to negotiate and solve tough problems.

Not that the sequester can be equated with, you know, the potential dissolution of the Union, but still . . .

Maybe if the White House offered to buy the popcorn?

Something in the airwaves

Speculation has long been swirling around who might replace Federal Communications Commission Chairman
Julius Genachowski
. But hold the phone — all that sturm and drang may be for naught.

It appears he’s staying put for a bit.

Yes, technically, Genachowski’s term expires June 30. But by law, he can remain until Congress leaves town at the end of 2014. Other signs that he’s sticking around include a planned appearance at the National Association of Broadcasters conference in April, and his continued interest in the FCC’s plan to buy back television licenses and auction the spectrum to wireless providers, something we’re told Genachowski feels ownership of.

The White House is plenty busy filling all the actual vacancies that have cropped up in President Obama’s second term (starting with seven Cabinet or Cabinet-rank jobs), so finding a replacement for Genachowski apparently isn’t high on the to-do list.

For his part, Genachowski has deflected questions about when he might step down.

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World powers, Iran bid to break nuclear stalemate

ALMATY, Kazakhstan: World powers meet negotiators from Iran in Kazakhstan on Tuesday in the hope of reaching a breakthrough in the decade-long crisis over its nuclear programme, despite low expectations after years of dashed hopes.

They are hoping to coax concessions out of Iran by advancing a new offer but Tehran has already doused expectations by installing new centrifuges and saying it will not go beyond existing obligations.

The two-day meeting under the shadow of the Tien Shan mountains in the Kazakh city of Almaty comes as sanctions bite against the Islamic republic and Israel still refuses to rule out air strikes to knock out Iran's suspected nuclear weapons drive.

Little apparent progress has been made since the last such session of talks in Moscow in June 2012 ended without any breakthrough and the crux of the dispute remains Iran's insistence on not abandoning uranium enrichment operations.

"We don't expect any breakthrough. The Iranians have made different declarations in the last days. It depends if you take the positive or the negative ones," said one Western official who asked not to be named.

World powers will present Iran with a "good" offer, said Michael Mann, the spokesman for EU foreign policy chief Catherine Ashton.

"We hope that Iran will seize this opportunity and come to the talks with flexibility and commitment to make concrete progress towards a confidence-building step."

A source close to the negotiations said that the world powers in their offer would stick to their insistence that Iran halts enriching uranium to 20 percent, shuts down its controversial Fordo uranium enrichment plant and sends abroad all uranium already enriched to 20 percent.

Previous reports have said that Iran could in return be offered a softening of the sanctions regime against Tehran, possibly starting with a lifting of measures against its gold industry.

The atmosphere has already been clouded by a UN nuclear watchdog report saying Iran started installing next-generation centrifuges at its Natanz nuclear plant, a move Washington said would be "provocative".

Meanwhile, chief Iranian nuclear negotiator Saeed Jalili said Saturday Tehran will not go beyond its obligations or accept anything outside its rights under the non-proliferation treaty (NPT).

Iran's supreme leader Ayatollah Ali Khamenei, who has the last say in all foreign policy matters, has effectively rejected the offer of direct US talks and appeared to order a tough line in Almaty.

Khamenei defiantly claimed earlier this month that even though Iran has no intention of developing nuclear weapons, the United States could not thwart Tehran if it wanted to.

The talks involve the so-called 5+1 world powers on one side -- Britain, China, France, Germany, Russia and the United States -- and Iran's team led by Jalili on the other.

They come with the lingering threat of Israel launching a unilateral strike on Iran just as it had done against the Osirak nuclear reactor in Saddam Hussein's Iraq in 1981.

Such action would almost certainly drag the United States into a conflict it clearly wants to avoid and leave the global economy in peril due to the impact on the price of oil.

Strikes would also risk sparking a broader Middle East conflict -- a danger the region can hardly afford with the violence raging in Syria.

Analysts said Israel's "red line" would be a decision by Iran to enrich uranium above its current upper limit of 20 percent -- within reach of weapons-grade uranium but necessary for Iran's medical research.

Iran already has a nuclear power plant in the southern city of Bushehr -- built with Russian help -- but Khamenei has described atomic weapons as a "sin".

- AFP/fl

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Sharks Warn Off Predators By Wielding Light Sabers

Diminutive deep-sea sharks illuminate spines on their backs like light sabers to warn potential predators that they could get a sharp mouthful, a new study suggests.

Paradoxically, the sharks seem to produce light both to hide and to be conspicuous—a first in the world of glowing sharks. (See photos of other sea creatures that glow.)

"Three years ago we showed that velvet belly lanternsharks [(Etmopterus spinax)] are using counter-illumination," said lead study author Julien Claes, a biologist from Belgium's Catholic University of Louvain, by email.

In counter-illumination, the lanternsharks, like many deep-sea animals, light up their undersides in order to disguise their silhouette when seen from below. Brighter bellies blend in with the light filtering down from the surface. (Related: "Glowing Pygmy Shark Lights Up to Fade Away.")

Fishing the 2-foot-long (60-centimeter-long) lanternsharks up from Norwegian fjords and placing them in darkened aquarium tanks, the researchers noticed that not only do the sharks' bellies glow, but they also had glowing regions on their backs.

The sharks have two rows of light-emitting cells, called photophores, on either side of a fearsome spine on the front edges of their two dorsal fins.

Study co-author Jérôme Mallefet explained how handling the sharks and encountering their aggressive behavior hinted at the role these radiant spines play.

"Sometimes they flip around and try to hit you with their spines," said Mallefet, also from Belgium's Catholic University of Louvain. "So we thought maybe they are showing their weapon in the dark depths."

To investigate this idea, the authors analyzed the structure of the lanternshark spines and found that they were more translucent than other shark spines.

This allowed the spines to transmit around 10 percent of the light from the glowing photophores, the study said.

For Predators' Eyes Only

Based on the eyesight of various deep-sea animals, the researchers estimated that the sharks' glowing spines were visible from several meters away to predators that include harbor seals (Phoca vitulina), harbor porpoises (Phocoena phocoena), and blackmouth catsharks (Galeus melastomus).

"The spine-associated bioluminescence has all the characteristics to play the right role as a warning sign," said Mallefet.

"It's a magnificent way to say 'hello, here I am, but beware I have spines,'" he added.

But these luminous warning signals wouldn't impede the sharks' pursuit of their favorite prey, Mueller's bristle-mouth fish (Maurolicus muelleri), the study suggested. These fish have poorer vision than the sharks' predators and may only spot the sharks' dorsal illuminations at much closer range.

For now, it remains a mystery how the sharks create and control the lights on their backs. The glowing dorsal fins could respond to the same hormones that control the belly lights, suggested Mallefet, but other factors may also be involved.

"MacGyver" of Bioluminescence

Several other species use bioluminescence as a warning signal, including marine snails (Hinea brasiliana), glowworms (Lampyris noctiluca) and millipedes (Motyxia spp.).

Edith Widder, a marinebiologist from the Ocean Research and Conservation Association who was not involved in the current study, previously discovered a jellyfish whose bioluminescence rubs off on attackers that get too close.

"It's like paint packages in money bags at banks," she explained.

"Any animal that was foolish enough to go after it," she added "gets smeared all over with glowing particles that make it easy prey for its predators."

Widder also points out that glowing deep-sea animals often put their abilities to diverse uses. (Watch: "Why Deep-Sea Creatures Glow.")

"There are many examples of animals using bioluminescence for a whole range of different functions," she said.

Mallefet agrees, joking that these sharks are the "MacGyver of bioluminescence."

"Just give light to this shark species and it will use it in any possible way."

And while Widder doesn't discount the warning signal theory, "another possibility would be that it could be to attract a mate."

Lead author Julien Claes added by email, "I also discovered during my PhD thesis that velvet belly lanternsharks have glowing organs on their sexual parts."

And that, he admits, "makes it very easy, even for a human, to distinguish male and female of this species in the dark!"

The glowing shark study appeared online in the February 21 edition of Scientific Reports.

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