(of an organism or tissue) living in the absence of air or free oxygen. pertaining to or caused by the absence of oxygen.
Parakeets can breed year round if conditions are right in their environment. Normal breeding season begins early in the year and continues until fall. It is very rare to see parakeets mating, but a male and a female must mate to keep the eggs fertile.
Once a breeding pair is placed together in a separate flight cage with an attached nest box, they typically spend 2-3 weeks bonding, then mating, before the first egg is laid. The hen (momma parakeet) lays one egg every other day until she has 2-8 eggs in her clutch (4-6 is typical).