Of those swimming creatures that appear to have feet, as is the
case with the molluscs, these creatures swim by the aid of their
feet and their fins as well, and they swim most rapidly backwards in
the direction of the trunk, as is the case with the cuttle-fish or
sepia and the calamary; and, by the way, neither of these latter can
walk as the poulpe or octopus can.
The hard-skinned or crustaceous animals, like the crawfish,
swim by the instrumentality of their tail-parts; and they swim most
rapidly tail foremost, by the aid of the fins developed upon that
member. The newt swims by means of its feet and tail; and its tail
resembles that of the sheatfish, to compare little with great.
Of animals that can fly some are furnished with feathered wings,
as the eagle and the hawk; some are furnished with membranous wings,
as the bee and the cockchafer; others are furnished with leathern
wings, as the flying fox and the bat. All flying creatures possessed
of blood have feathered wings or leathern wings; the bloodless
creatures have membranous wings, as insects. The creatures that have
feathered wings or leathern wings have either two feet or no feet at
all: for there are said to be certain flying serpents in Ethiopia that
are destitute of feet.
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