The opah was long considered a slow-moving fish, like many of the other species that inhabit the deep sea ... “But because it can warm its body, it turns out to be a very active predator that chases ...

Unfortunately for the species however ... Atlantic bluefins are warm-blooded, a rare trait among fish, and are comfortable in the cold waters off Newfoundland and Iceland, as well as the tropical ...

Overfishing is driving this mighty warm-blooded fish toward the brink of extinction ... tuna as endangered or critically endangered on its “Red List” of imperiled species. The Pacific bluefin tuna was ...

Animals can be either warm-blooded ... fish, their bodies tend to be flat when viewed head-on from the front. Snakes, lizards, and worms tend to be long and slender. These shapes ensure they can heat ...

The ocean’s most formidable cold-hearted killer, the long-extinct giant megalodon shark, may have been warm-blooded ... shark species (Otodontidae) “as well as the largest fish that ...