Hybrid animals can be created in zoos and laboratories. But mixed-up animal mating is also occurring in nature.
While climate change is bad for most of us, grizzly bears may not complain too much -- at least in the near-term.
Researchers at Penn State University and the University of Buffalo have completed the most in-depth bear DNA study to date.
Thanks to its thick coat of fur, its tough hide, and a four inch layer of blubber, a polar bear is extremely well insulated.