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The curious little flying-squirrel, however, is a stranger even to those to whom he may be a near neighbor, for the reason that his habits are chiefly nocturnal. He ventures out occasionally on a cloudy day, but is shy and retiring. Thoreau relates an interesting experience with one. He captured it in a decayed hemlock stump, wherein it had a little nest of leaves, bits of bark, and pine needles.
This homology goes so far within one class, particularly within the class of mammalia, that, for instance, the hands and feet of man, the hands of the ape, the paws of the beast of prey, the hoof of the horse and of the ox, the paws of the mole, the fins of the seal and of the whale, the wing-membranes of the flying-squirrel, correspond to one another in their smallest parts and ossicles, and can all be registered with the same numbers and letters; i.e., they are homologous to one another even to the minutest detail.
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