(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.
When they mature, males will have BLUE ceres and when it is breeding season they will turn an even darker blue. Keep in mind that this is for NORMAL parakeets; not lutinos or albinos. In normal female parakeets, the cere can range in colors. The femal's cere may be brown, white, pink, and various shades inbetween. When a female enters breeding season their cere will get a crusty look and will be a dark brown. After breeding season has passed the cere crust will fall off. 8 people found this useful.