The etymology of "chauve" (bald) in "chauve-souris" (bat) is debated, but I've often read that it could be a deformation of a word designating an owl or a crow (it would be a cognate with the late Latin "cavannus" (tawny owl), for example).

On a similar note, the "cerf" (deer) in "un cerf-volant" (a kite toy) probably derive from occitan sèrp (snake) as a reference to dragon-shaped kites from Asia.