This scratchy hiss is the closest thing yet to caterpillar vocalization

Pulling air into the gut helps sphinx hawk moth larvae make their own teakettle howl

teakettle caterpillar

HEAR ME ROAR   Annoy this Nessus sphinx hawk moth caterpillar and it will create a hissing noise, perhaps similar to the way teakettles whistle.

J. Yack

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