YES
Yes.
To preen just means to groom the feathers. Birds may do this to their young and possibly other birds. If they like you, they might try to do this to your hair.
This could be a trick question. No other animal lays eggs in human hair while that hair is still attached to a human head, but hair that falls off or is cut off and blows away in the wind may be collected by birds and incorporated into their nests, where they will lay their eggs.
No. Birds have feathers, not hair.
They should be, but be cautious. Some companies do advertise human hair, but it's human hair blend or human hair mixed with animal hair.
Mammals are not covered with feathers. Mammals grow hair, but do not have to be covered with hair. Birds are covered with feathers.
While there are robots designed to mimic human appearance, there are no robots with actual human hair. Some advanced robots may have synthetic hair or materials that resemble human hair, but not actual human hair.
no they have feathers
No, there is no human hair in bread.
No, they have feathers.
Keratin is a type of structural protein that is found in the human skin, nails, and hair. Most other members of the kingdoms of Animalia share keratin in their skin, claws, and hair as well; reptiles, birds, amphibians, and mammals.
A single strand of human hair is called a "strand" or "hair follicle".