Killer whales are the only natural predator of baleen whales—those that have "baleen" in their mouths to sieve their plankton diet from the water. More solitary than toothed whales, baleen whales face ...

New research finds some baleen whale species call at such deep frequencies that they're completely undetectable by killer whales, which cannot hear sounds below 100 hertz. These also tend to be the ...

For nearly 30 million years, a 2,000-pound beast known as the entelodont ruled a sweeping empire from Mongolia to what is now ...

A new film spotlights the sea lamprey, also known as "Dracula of the Lakes," a species which pushed Great Lakes fisheries to ...