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.
When it comes to birds, preening serves a few difference purposes. Preening aligns their feathers to provide insulation and protection from weather. It's also a way for them to get rid of lice, and it makes them more attractive to potential mates.very feather has tiny interlocking hooks called barbs, and preening makes all of the tiny barbs line up like a â¦ zipper. Preening makes a bird look and feel its best. While preening, birds will also pluck dead feathers and pick the sheaths off of new growing feathers.