(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.
Spring is the typical mating season for most bird species because food sources are increasing, melting snows and spring rains provide plenty of water and there will be a long, temperate season for birds to mature before winter arrives.o pinpoint when the bird mating season occurs, watch for: 1  Warming temperatures and blooming flowers that show the change of seasons. 2  Birds claiming territory and becoming more aggressive toward intruders, particularly males.