Moult in a sentence as a noun

It is a shortening of feathers, that would be undone by the annual moult.

Moult definitions

noun

periodic shedding of the cuticle in arthropods or the outer skin in reptiles

See also: molt molting moulting ecdysis

verb

cast off hair, skin, horn, or feathers; "our dog sheds every Spring"

See also: shed molt exuviate slough