Where did I say that? Don't be so hasty in the intoxication of your exuberance to laugh .
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Who said anything about grinding their lower jaw?
Like all large carnivores, wolves have strong jaws and teeth. Like humans, wolves possess incisors, canine teeth, premolars and molars. A wolf's jaw, akin with other canines, is armed with 42 teeth. The small incisors are used for nibbling, such as cleaning the meat off bones. The purpose of the wolf's long, pointed, and very strong canine teeth is to capture and hold prey. Wolves use their teeth as sort of a vise, and also, to tear food apart. The grinding molars at the back of a wolf's mouth, called carnassial teeth, are used to chew food up.
It is estimated that a wolf's jaw can exert more than 1500 pounds of pressure per square inch. It's easy to see how a wolf is capable of breaking the femur of an adult moose. "The power of a wolf's bite is incredible," says David Mech. He recounts watching wolves on the run leap at the rump of an adult moose and rip it open, even though this meant tearing through four inches of finely packed hair and a thick hide. He notes that wolves also hook their fangs into the rubbery nose of a moose and "can cling there despite the swinging head of the moose, which may even raise the wolf off the ground."
Wolves strong teeth and jaws are connected to strong skulls which are large, long, and taper forward, averaging nine to eleven inches long and five to six inches wide. Mech notes that the "volume of the brain case is 150 to 170 cm3, which is at least 30 cm3 greater than that of most dogs."