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.
Most birds will preen several times a day to keep themselves healthy. The uropygial gland, or preen gland, is an essential part of preening. This gland is found near the base of the tail and produces an oily substance that contains diester waxes that help waterproof feathers and keep them flexible.While preening, birds will spread this oil to each feather.Some types of birds, including owls, pigeons, parrots and hawks, lack a uropygial gland and instead have specialized feathers that disintegrate into powder down, which serves the same purpose as preen oil.hy Preening Is Essential. Preening serves several essential purposes for birds, including: 1  Aligning feathers for optimum waterproofing and insulation. 2  Aligning feathers into the most aerodynamic shape for easier, more efficient flight. 3  Removing feather parasites and body lice that can destroy feathers or carry disease.