Genetic drift results from the role that probability plays in whether a given trait will be passed on as individuals survive and reproduce.

An individual can reproduce twelve days after being born and there may be twenty generations over the course of a year in warmer areas.

Inbreeding depression can result when individuals which are too closely related reproduce and this diminishes survival of the young.

Semisocial: a few individuals reproduce, yet the arrangement is not quite eusocial.

After a while, individuals from one group can no longer reproduce with the other group.

With a certain rate randomly chosen individuals reproduce, i.e. add another ball of their own color to the urn.

In asexual reproduction, an individual can reproduce without involvement with another individual of that species.

A female individual cannot reproduce sexually without access to the gametes of a male (an exception is parthenogenesis).

On average, a female will create approximately 6-16 eggs per year, although some female individuals may not reproduce each year.

As with other birds, an individual may reproduce several times over its lifetime.