Гугланул на английском.
Do birds have hair?
Answer 1 :
Birds have feathers while mammals have hair.
Answer 2 :
No, birds do not have hair. Birds are characterised by the presence of feathers, while mammals are characterised by the presence of hair. Feathers of birds come in different forms including down feathers which appear fluffy and are dominant in hatchlings. They give good insulation to the hatchlings and look like hair.
Answer 3 :
Birds have feathers only. Feathers evolved from reptilian scales. Hairs are found only in one vertebrate group- mammals.
Answer 4 :
Birds have 'hair' and they are called rictal bristles, which are hairlike feathers that occur mostly around the base of the bill, nostrils and eyes.
These rictal bristles are modified from contour feathers in that they are without vanes. The word 'rictal' comes from 'rictus' which refers to the gape of the mouth. The function of the bristles occurring around the mouth is to increase the effective use of the gape (e.g. flycatchers and barbets). Eye bristles function as protective eyelashes (e.g. ostriches and hornbills) while bristles over the nostrils filter dust from the air.
However scientists in the past have traced the development of such bristles to that of feathers and they are not to be confused with the hair of mammals. So we call the outer covering for birds as feathers, mammals we call hair, and fish we call scales.
Короче, птицы имеют только перья... Посмотрел еще пару источников... Химическией состав разный у перьев и волос (меха).
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