CHAP. 55. (39.)—THE BIRDS CALLED APODES, OR CYPSELI.
Those birds which are known as "apodes" [Note] fly the most of
all, because they are deprived of the use of their feet. By
some persons they are called "cypseli." They are a species of
swallow which build their nests in the rocks, and are the same
birds that are to be seen everywhere at sea; indeed, however
far a ship may go, however long its voyage, and however great
the distance from land, the apodes never cease to hover around
it. Other birds settle and come to a stand, whereas these know
no repose but in the nest; they are always either on the wing
or else asleep.
