IPA: /ˈnɛs.lɪŋ/
KK: /ˈnɛs.lɪŋ/
A young bird that is still in its nest and has not yet learned to fly.
The nestling chirped loudly, waiting for its mother to bring food.
Nestling → It is formed from "nest" (from Old English "nest", meaning a structure built by birds for laying eggs and raising young) and "-ling" (a diminutive suffix meaning small or young). The word "nestling" refers to a young bird that is still in the nest.
Think of a small bird ('-ling') that is still in its 'nest' — that's what a nestling is.