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How do carnassial teeth help carnivores eat meat?

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Carnassial teeth, also known as shearing teeth, are specialized structures in many members of the order Carnivora that function to slice meat and cut through tough sinews.

These teeth are typically formed by the fourth upper premolar and the first lower molar. They operate with a scissorlike action, working against each other to effectively process animal tissue. This adaptation is most highly developed in species that are strictly carnivorous, such as cats, hyenas, and weasels. In contrast, omnivorous members of the order, such as bears, or those that primarily consume fish, such as seals, show little to no modification of these teeth for shearing.1