Ha na-eme ka ụgbọ elu dị mfe, na-enye ihe mkpuchi nke na-enyere aka na thermoregulation, ma na-eji na ngosi, mkpuchi, na akara. E nwere ọtụtụ ụdị nke feathers, onye ọ bụla na-eje ozi ya set nke nzube. Feathers bụ epidermal uto mmasị akpụkpọ na-ebilite naanị na kpọmkwem traktị nke akpụkpọ akpọ pterylae. Nkesa nke ndị a feather traktị (pterylosis) na-eji na taxonomy na systematics. The ndokwa na ọdịdị nke feathers na ahụ, a na-akpọ feathering, nwere ike ịdị iche iche n'ime umu, na-elekọta mmadụ ọnọdụ, na mmekọahụ. feathering na-mgbe niile feathering; feathering nke a na-akpọ feathering mgbe feeding na-amalite dị ka "n'ime moultripetaries" bụ isi moultripetaries na-abụghị moultripetaries, na-eji feathers na-anọchi na nke mbụ moultripetaries na nke abụọ moultripetaries.
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