It started with James Gunn's instruction to Sean that he play Weasel as if he was "a big dog." "Weasel doesn't think in dialogue," Sean Gunn says. "But for any of us who have and love dogs ...

This animal's long slender body, like that of a weasel, enables it to crawl in and out of the holes and dwellings of its primary prey—the prairie dog. Though black-footed ferrets sometimes eat ...