Here are some of the animals--both on sea and on land--that existed during this mega-sized sharkâ€™s heyday.
With fangs and the first sawlike teeth on Earth, the biggest predator in the swamps of the early Permian Period ate anything it wanted.
Here are just a few of the multiple species that will benefit from a new marine reserve in the Pacific.
Sharks might not win any prizes for smarts, but they often behave like brilliant mathematicians.
Populations are predicted to decline by around 44 percent due to how temperature and pH impact developing shark embryos and juvenile sharks.
Five new shark species, along with two species of manta ray, gain new worldwide protection next month.
Fisherman off Florida's Gulf Coast loses shark on his line to another fish with more immediate plans for the small blacktip.
The idea of a shark attacking someone in the ocean is scary enough, but this week, a 7-year-old boy was bitten by one of these fearsome fish in a lake.
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