Moonfish: The First Warm-Blooded Fish (Photos)

by Jeanna Bryner, Live Science Managing Editor

The moonfish, which are about the size of a manhole cover, is now considered the first-known warm-blooded fish, scientists report in the journal Science. Through some physiological tricks, the fish is able to keep its entire body — heart, brain, swimming muscles and viscera — warmer than the surrounding water. Here are photos of the distinguished fish, which is also called an opah. [Read the full story on the warm-blooded moonfish]...Continue reading, photos...