a bat (see Molina); literally, its name says flying mouse (SW)
Alonso de Molina:
quimichpatlan. murcielago. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 90r. col. 1. Thanks to Joe Campbell for providing the transcription.