(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.
It takes between 17 and 20 days for parakeet eggs to hatch. The female parakeet lays an egg approximately every other day until her entire clutch has been laid. A clutch is typically four to six eggs, but it is not unusual for the number to fall outside that range.