pīpĭlo, āre, v. n. [pipio],
to peep , pip , chirp : ad solam dominam usque pipilabat (passer), Cat. 3, 10; Poët. ap. Anth. Lat. t. 2, p. 294 Burm.
pīpilō —, —, āre, to peep, chirp, Ct. ...
An Elementary Latin Dictionary