CHAP. 81. (61.)—THE ONLY WINGED ANIMAL THAT IS VIVIPAROUS,
AND NURTURES ITS YOUNG WITH ITS MILK.
Among the winged animals, the only one that is viviparous
is the bat; it is the only one, too, that has wings formed of a
membrane. This is, also, the only winged creature that feeds
its young with milk from the breast. The mother clasps her
two young ones as she flies, and so carries them along with
her. This animal, too, is said to have but one joint in the
haunch, and to be particularly fond of gnats.