Of land animals some are furnished with wings, such as birds
and bees, and these are so furnished in different ways one from
another; others are furnished with feet. Of the animals that are
furnished with feet some walk, some creep, and some wriggle. But no
creature is able only to move by flying, as the fish is able only to
swim, for the animals with leathern wings can walk; the bat has feet
and the seal has imperfect feet.
Some birds have feet of little power, and are therefore called
Apodes. This little bird is powerful on the wing; and, as a rule,
birds that resemble it are weak-footed and strong winged, such as
the swallow and the drepanis or (?) Alpine swift; for all these
birds resemble one another in their habits and in their plumage, and
may easily be mistaken one for another. (The apus is to be seen at all
seasons, but the drepanis only after rainy weather in summer; for this
is the time when it is seen and captured, though, as a general rule,
it is a rare bird.)
Again, some animals move by walking on the ground as well as by
swimming in water.
Furthermore, the following differences are manifest in their
modes of living and in their actions.
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