When do you need a broadsword, and when would you be better off with a dagger? That’s the question that faced artiodactyls, the group of mammals that includes deer, antelope, goats, giraffes, pigs, buffalo and cows, during their evolution. Many male artiodactyls fight over females using weaponized body parts such as horns and antlers. But pigs and several groups of deerlike animals have tusks instead, and a few species have both. Water deer have tusks so pronounced they are nicknamed “vampire deer.”
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