The number of bull sharks -- one of the most aggressive species of shark in the world -- increased significantly in a 20-year period, and researchers say warmer seawater is to blame. Increasing ...

But not quite. One particular shark has a pronounced ability to switch from salty ocean water to fresh water as necessary: the bull shark. Bull sharks can grow up to 11 feet long and weigh up to ...

AUSTIN, Texas — It has already been viewed more than 700,000 times: a viral video on TikTok of a Texas man catching a bull shark in the Guadalupe River. But is it real? The 230-mile-long river ...