piaillement means “chirping” | MotiTan French Dictionary

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Un piaillement aigu a attiré mon attention près de la fenêtre.

A high-pitched chirp attracted my attention near the window.

A repeated burst of thin, sharp calls from nestlings or other small birds.

cri: A loud, forceful, unmistakable shout.
pépiement: A short, quiet peep from a small bird.

Cri bref et perçant produit par de jeunes oiseaux ou par de petits oiseaux, souvent répété.

Piaillement is formed from the verb piailler, a French verb for making shrill cries, with the noun suffix -ment.

Piaillement is masculine, so the phrase is le piaillement, and its plural is les piaillements.