(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.
Generally parakeet eggs begin to hatch within 18 days. They will probably hatch in the order they were laid, separated by the same number of days in the fashion which they were laid. Occasionally, a hen will begin to incubate the eggs at the same time, in which case, the eggs will hatch more closely together.