Dozens of beaches along the turquoise coastlines of Pernambuco have been issued with shark warnings, authorities said.

A giant trap mission turned insane when real freshwater sharks showed up and were brought back for the backyard pond.

Researchers have documented the births of nearly two dozen North Atlantic right whale calves this season. It’s an encouraging ...

These “walking sharks” can lay eggs without spending extra energy, rewriting what scientists thought they knew about reproduction.

New research shows that epaulette sharks, often called “walking sharks,” can produce eggs without increasing their overall energy use.