Gizzard

Definition and stakes

Portrait of Philip Henry Gosse Philip Henry Gosse,  Natural History, Birds (1849)

“ The gizzard is large and muscular, and especially in those species which are more terrestrial, living largely on grain. They mostly nestle on the ground, but some on trees, and lay numerous spotless eggs; the young are at first covered with down, and are able to run and to swim as soon as they are hatched. ”
Source: Wikisource

Portrait of Herman LeRoy Fairchild Herman LeRoy Fairchild,  Popular Science Monthly (1880)

“ In other animals the gizzard, if a distinct cavity, usually precedes the true stomach. The power of this mill is proportional to the resistance of the food. Thus in flesh-eating birds the gizzard is weak.
Mastication is best exhibited in mammals and is almost entirely by means of teeth. Mammalian teeth are of three kinds: incisors or front cutting teeth; canines, which characterize flesh-eaters; and molars or masticators. They are placed in sockets in the bones, but always in a single row on the outer edge of the jaws, and are never renewed more than once.
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Source: Wikisource

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