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Scientists have documented leopard sharks (Stegostoma tigrinum) off the coast of Samoa, providing the first verifiable evidence that the species is found in these waters.

Many shark and ray species embark on mammoth migrations. But to protect these species, we need to know not only how far an animal moves, but whether it crosses national borders.

Researchers have now documented the first known occurrences of white sharks (Carcharodon carcharias) in the Flower Garden Banks National Marine Sanctuary and surrounding outer continental shelf ecosystem, suggesting that a network of offshore reefs may form part of a seasonal migration corridor for white sharks traveling thousands of kilometers across the western North Atlantic.

A basking shark was spotted swimming near the Bedford Basin Yacht Club. (Watch Video)

Dozens of shark and ray species are known to spend some or all of their life cycle in freshwater environments, but they remain among the least studied and least protected.

After decades of sporadic sightings across South and Southeast Asia, the last stronghold of the Ganges shark may have been found in a remote corner of Indonesia. New fieldwork now offers fresh hope that it might have a future there. 

Now, buried in what was once the floor of that long-ago sea, on the Abu-Tartur Plateau, paleontologists have found evidence of its lushness: the teeth of sharks that would have thrived amid the bounty of fish.

Scientists in Albania confirmed the first-ever case of identical twins in small spotted catsharks.

On many beaches in Southern California, stingray incidents have spiked from a year ago thanks to a marine heat wave that has drawn more swimmers and rays to the shore which should only become more frequent due to expected El Niño conditions.

Scientists have taken advantage of this DNA time machine for one of the world's most endangered marine animals, revealing a story that can't be told by population counts alone.