(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.
Most raccoons in North Dakota mate in early February and March. About 60 percent of the female raccoons breed and produce litters when they are one year old while males typically do not breed until their second year. Raccoons do not form pair bonds. A male raccoon will typically associate and mate with several females each spring. The gestation period for raccoons is about 63 days with a litter averaging four to six young being born during April or May in a den prepared by the female.