black-footed ferret

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A North American weasel (Mustela nigripes) that is yellowish above, mixed with brown on the head and neck, and has a blackish mask and feet. It is related to the European polecat.

GNU Webster's 1913

1. n. a weasellike mammal (Mustela nigripes) inhabiting the western North American prairie, having dark feet, a dark-tipped tail, and a dark face on a yellowish-brown coat. It is an endangered species.

WordNet 3.0

1. n. musteline mammal of prairie regions of United States; nearly extinct