It’s difficult to imagine the voracious great white shark as prey. Could orcas really be overpowering them and removing their livers?

The rare frilled shark is considered a “living fossil,” as its makeup has remained unchanged for 80 million years. This summer, researchers found one alive and thriving off the coast of Portugal, adding evidence regarding the resilience of this ancient sea creature. The shark was discovered off the Algarve coast by researchers who were working on a European Union project in the area, the BBC reported. The aim of the project was to "minimize unwanted catches in commercial fishing," but the team unknowingly unearthed one of the rarest and most ancient animals on the planet.

Three species of sharks and three species of rays will now have extra protection wherever they go, thanks to a conservation agreement signed by 126 countries around the world.

It's been a good week for beleaguered sharks. A cross-border conservation pact signed by 126 countries this week promises for the first time to extend extra protection to sharks and several other migratory species, whichever countries they stray into.

Sharks in a volcano? It's true.

Normally, not something you want a shark scientist to say. But Eric Stroud is talking about his chemistry-lab quest for the ultimate shark repellent, which he appears to have found. The questions that remain: Does it work on the great white, the ocean’s most fearsome predator? And can a couple of rookie entrepreneurs get it to market? By Charles Bethea.

When Ecuadorean authorities boarded the Fu Yuan Yu Leng 999 earlier this month off the Galápagos Islands, they had little idea what awaited them. Officials at the Galápagos National Park had called in the navy to investigate the Chinese-flagged vessel, which had been sailing through the area's marine reserve without explanation.

Florida wildlife officers made a grisly discovery aboard a Key West shrimp boat this week: dozens of pairs of dismembered shark fins. The boat was discovered about 20 miles north of the island Wednesday night, an indication that illegal finning still occurs in Florida waters despite being banned more than 16 years ago. Buying and selling fins also remains legal in most states, fueling a practice that targets some of the world’s biggest and longest-lived sharks that are also among the planet’s oldest species.

A female shark separated from her long-term mate has developed the ability to have babies on her own.

Inland Maya communities knew an awful lot about sharks without ever visiting the sea.

Despite evolving separately for 400 million years, some sharks and tuna share genetic traits linked to higher metabolism and quick swimming behaviour. Tuna fish and the lamnid group of sharks, which includes great white sharks, share some similar traits that help make them super predators, including their style of swimming and their ability to stay warm.

Sharks can live to be at least 272 years old in the Arctic seas, and scientists say one recently caught shark may have lived as long as 512 years. That's according to a study published Thursday in the journal Science that says Greenland sharks can live longer than any other known animal advanced enough to have a backbone. Until now, the record-holder for the oldest vertebrate was the bowhead whale, known to have lived up to 211 years.

It opened its mouth and a murder mystery came out. By Matt Soniak.

A conservation group has taken the unusual step of buying a commercial shark fishing licence on the Great Barrier Reef, and will retire it, saving the sharks that it would otherwise be used to catch. WWF said it was now seeking funds to cover the cost of the $100,000 licence, which gives the owner the right to drag a 1.2km net anywhere along the length of the Great Barrier Reef, targeting sharks. It can also be used for fishing with lines to target other species.

Shark population decrese were found to have been caused by human harm to the seas --- the international fin harvesting of shark's fins.

A new insight into how sharks regenerate their teeth, which may pave the way for the development of therapies to help humans with tooth loss, has been discovered by scientists at the University of Sheffield.

Last year was not a good time to swim with sharks, according to new data. The big fish attacked humans 98 times worldwide last year, the most since the University of Florida began recording the International Shark Attack File 57 years ago. The incidents tallied by the Florida Museum of Natural History at the University of Florida do not include those in which a human provoked the shark, according to a statement from the museum.

Forget Google Maps – these sharks get directions from their noses. A recent study led by Andrew Nosal, a postdoctoral researcher at Scripps Institution of Oceanography and the Birch Aquarium, found that scent could be an important navigational tool for leopard sharks. In a controlled experiment, sharks with unimpaired olfaction were able to swim back to their coastal habitats more efficiently than their scent-compromised counterparts.

Thrashing yet graceful, aggressive yet misunderstood – if one species in the animal kingdom is a metalhead, it would have to be the great white shark.

The government of the Australian state of New South Wales is deploying drones, sonar and helicopters this summer in a bid to protect beachgoers from sharks. At an event at Sydney's Coogee Beach on Sunday, Minister for Primary Industries Niall Blair formally announced a world-first A$16 million (US$12 million) shark strategy.