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..
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.