A male babirusa's canines are an evolutionary mystery: They never stop growing, they're too fragile to hunt or forage with, and, given time, they end up twisting and penetrating the animal's own skull! Watch the Full Episode with your FREE trial for Smithsonian Channel Plus by signing up today at https://watch.smithsonianchannel.com/ From: CRAZY MONSTER: Fangs http://bit.ly/2k4zlAP
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