Africa's tree climbing goats.

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Most goats graze in pastures, but these Moroccan goats prefer to hang out in trees. The horned mammals are no different from those you see in the U.S., but they're drawn to the local argan tree for its fruit, which ripens in early summer. (The fruit's seeds are pressed to make argan oil, which is used in cosmetics and can cost up to $50 for a 1.7-ounce bottle.) Goats in trees may look funny, but they're not harmless: By eating the fruits, leaves, and buds, the animals stunt the trees' growth--and can kill them over time. Argan trees grow only...