chitteringгерундий или причастие настоящего времени Used attributively to describe animals or sounds that are emitting rapid high-pitched noises, or figuratively to indicate trembling.
The chittering monkeys swung from branch to branch.
Les singes gazouillants se balançaient de branche en branche.
piaillantS'emploie surtout pour des oiseaux ou de petits animaux; ton expressif.