A captive wolf howls in this thermal image from the Grizzly and Wolf Discovery Center in West Yellowstone, Mont. USGS scientists are examining thermal imagery to assess impacts of sarcoptic mange on the survival, reproduction and social behavior of wolves.
The bright red patch on this captive wolf’s hindquarters is where fur was shaved to replicate the loss of fur associated with sarcoptic mange.
Sarcoptic mange mites were introduced to the Northern Rockies as a way to wipe out wolves and coyotes. See details inside.