(Or if you prefer, correcthorsebatterystaple.)
Heterodontism is the quality of possessing more than one tooth morphology. Mammals, for instance, are generally heterodont, because they have incisors, canines and molars. Reptiles, amphibians and fish are generally homodont instead.
What does this have to do with correct horse battery staples? Very little, but isn't it nice that you, dear reader, went googling for a term which showed up on xkcd and just happened to learn a new word? Two new words, actually.
Stick around, you might learn something interesting about zebras.
Or aardvarks.
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