The remains of a 415-million-year-old fish skull from Siberia — though miniscule in size — offer hints about the origins of all jawed vertebrates, ranging from reptiles to humans, a new study finds.
Feared by most, loved by some and hunted by many, sharks are one of the most mysterious groups of creatures roaming the Earth today. Defined as a fish with a full cartilaginous skeleton and a sleek, streamlined body, a shark can range in size from the two foot pygmy shark, to the colossal 50-foot whale shark.There are more than 250 different species of sharks currently identified, making it one of the most diverse animal genera on the planet. Sharks are found in every major body of saltwater in the world, but are more common in warmer waters. There are a small number of shark species that do thrive in fresh water, and certain sharks have been known to venture from their saltwater homes to major freshwater lakes and rivers.Most members
When researchers first looked at a tiny fish skull from 415 million years ago, they classified it as a bony fish. But a new, high-tech look at the fossil shows that it's much more.
For the first time, the movements of a wild hammerhead shark were tracked for a period of 10.5 months.
A new study of fossil records estimates that the 60-foot-long (18 meters) Megalodon shark went extinct 2.6 million years ago.
During the early Permian, carnivores greatly outnumbered herbivores on land, so top predator Dimetrodon supplemented its diet by hunting sharks.
When a shark is caught for sport, it often dies from its injuries — why are sharks not protected the way other animals are?
In a series of arrests from August to September, police caught four people peddling the gills, snouts and other parts of rays, among other grisly animal products.
Sharks might not be able to adapt to acidified ocean water if climate change continues as-is, new research suggests. Exposure to ocean acidification changed sharks' nighttime swimming behavior.
Good news for shark lovers: This weekend, new international laws will go into effect to strengthen protections for five shark species that are threatened by overfishing.
Sharks are not simple-minded killers — in fact, many tend to be social, with individual personalities.
Preventing shark attacks doesn't require culling sharks. A new study finds that a shark catch-and-release program in Brazil dramatically decreased, by 97%, the number of attacks on humans.
Good news for great whites: The sharks are on the rise off both the east and west coasts of the United States, two new studies show.
The plight of sharks gets a human angle with a new documentary about a 20-year-old Australian activist who has been diving with these marine predators since childhood.
With an underwater camera attached to his head, a diver captured a scary encounter with a great white shark off the coast of Florida.
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