When you see a weasel slink down a burrow, a badger trot off across the prairie, or an otter dive back under the waves, you might not realize they all have something in common. They are all mustelids. Mustelidae...

It’s 1700, and the first horses are just beginning to set hoof in the rolling grasslands of the Pacific Northwest. First brought to the New World by the Spanish 200 years prior, horses spread across...