this is so freaking cool. A fully warm blooded fish was just discovered in the deep sea off California. It lives where water temperatures are super cold and it keeps itself 4-5 degrees above the water temperature enabling it to have a massive advantage over all its prey whose metabolism is limited by the temperature.
here's a picture:
and here's the link to the article:
http://www.sciencemag.org/content/348/6236/786