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.
Birds. Birds have an uropygial gland, also called a preening gland, which produces an oily substance that they spread on their feathers with their beaks. The oil protects their skin and feathers from bacteria, fungi and pests. Preening behavior is also linked to mating rituals.hile technically preening is a bird-specific activity, the word preen is also used to describe social grooming. Many species -- birds, primates, lions and horses -- groom themselves and members of their social groups.