(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.
A cage for a pair of breeding Parakeets should be a minimum size of 20 x 20 x 20, and should contain a wooden nest box that is at least 12 x 12. Some Parakeet breeders place wooden inserts into the bottom of their nest boxes to prevent splay legs.