Other forms: critters
Critter is a homely word for a small animal. A mouse, a beetle, whatever is rustling in the hedge.
It is a dialect form of creature, chiefly American and rural, and it is warm rather than scientific, which is why nature programmes for children use it and journals do not. It covers anything small and living, including insects, which creature does not quite. There is a faintly affectionate tone even when the critter in question has got into the loft.
1nouncritterA small animal or creature.
“Some critter had been at the bird feeder.”
Also accepted in games: creature
Proto-Indo-European
*ḱer- (grow)
English, today
critter
First attested 1815, from a dialectal pronunciation of creature.
Etymology from Wiktionary, CC BY-SA