Wolverine (Gulo gulo). Courtesy of Anna Yu / AY Images. Copyright 2006 - Anna Yu.

Many thanks to Anna Yu / AY Images for providing some spectacular shots of this (captive) wolverine. We try our best to use images of animals in the wild, but wolverines are both rare and secretive, and use some of the most remote habitat in the northern hemisphere, so we can’t be too picky. Besides, Anna has a keen eye, and these are just awesome photos.