The playful North American river otter is equally at home ... River otters, members of the weasel family, hunt at night and feed on whatever might be available. Fish are a favorite food, but ...

Opinions expressed by Forbes Contributors are their own. I write about the world of biology. Colorado recently reintroduced wolves to the state. Now it’s looking to do the same for another ..

Link Olson holds the skull of a short-tailed weasel that a mountaineer donated to the University of Alaska Museum of the North. (Photo provided by University of Alaska Museum of the North ...