Carnassials are large teeth found in carnivorous mammals, designed for shearing flesh and bone in a scissor-like way. In the Carnivora, the carnassials are the last upper premolar and the first lower molar, but in the prehistoric creodonts, the carnassials were further back in the jaw - first upper and second lower or second upper and third lower molars.
Carnassials are the defining characteristic of the carnivora order; that is, they are the one thing that all of the animals within the order have in common.
Carnassial teeth all have three roots.
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