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.
Stress. The second most common reason that parrots pluck their feathers is stress. Parrots can become stressed because of lack of attention from their owners, dirty or cramped accommodations, and boredom.According to veterinarian Ron Hines, Some birds literally groom their feathers off for lack of other pastimes..tress. The second most common reason that parrots pluck their feathers is stress. Parrots can become stressed because of lack of attention from their owners, dirty or cramped accommodations, and boredom. According to veterinarian Ron Hines, Some birds literally groom their feathers off for lack of other pastimes..
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.