Called also neonate and newborn. premature infant (preterm infant) one born before a gestational age of 37 completed weeks (259 days). The duration of gestation is measured from the first day of the last menstrual period and is expressed in completed days or weeks.
Answer: Birds pluck their feathers for several reasons. In the wild, they use plucked feathers to line their nests during breeding season. Many bird feathers also come out as a bird performs its normal preening and grooming routine.In captivity, however, a plucking bird can be a sign of veterinary or environmental problems.f you suspect that your bird has been plucking its feathers, the best advice is to get your bird to an avian vet as quickly as possible. If the vet determines your bird to be free of PBFD or other medical problems, then your bird's plucking is most likely due to an environmental issue.
Tail feathers are balanced left and right of the center. Flight feathers have a wider and narrower side. This makes them better for flying because they can cut through the air with very little resistance (also called drag). Other types of feathers are made for use on the body of the bird. The downy feathers that are good for warmth are shown on the far right. Semiplume feathers also help to keep birds warm and they help water birds float. The bristle feathers are found around the eyes and nostrils, and for some birds that like to catch flying insects they can be seen around their mouths.