Your Monday Mustelid is the Patagonian weasel, Lyncodon patagonicus (de Blainville 1842). Unfortunately, I can't find a picture of the little blighter anywhere. Instead, here's a picture of a Eurasian badger (Meles meles) cub ...
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I've been remiss for a while and those of you who like the Monday Mustelid haven't been getting your fix. So here is a little something to tide you over. Three video full of badgery goodness.