(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.
The Turkey's Spring Courtship Ritual. The wild turkeyâs breeding season starts in February in southern regions and occurs in April or May farther north. The birdsâ urge to breed is triggered by increasing daylight hours, which stimulate the sex hormones of the toms. Cold and rainy weather can delay the onset of mating.