Scientists Announce the Discovery of the First Fully Warm-Blooded Fish – the Opah

”Scientists announced a startling discovery on Thursday: the existence of the only known truly warm-blooded fish—the opah, or moonfish.

Researchers from the National Oceanic and Atmospheric Administration (NOAA) outlined their discovery in the journal Science, upending the general classification that mammals and birds are warm-blooded and fish cold-blooded.”

Here’s more on the opah from National Geographic

Read more in Slate Magazine