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..
Definition: Preening is the process by which birds groom and care for their feathers. When a bird is preening, she uses her beak to pick through her feathers -- removing any d â¦ ebris, arranging feathers that are out of place, and distributing a special oil that is secreted from a gland at the base of the tail.This oil helps a bird's feathers stay healthy and shiny.reening refers to a bird grooming its feathers with its beak. Every 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.