These eggs develop into fertile males and fertile female queens.

After pupation, these fertile males and females will mate, setting up next year's cycle of growth.

There are more surplus males, fertile or not, than females in a hive.

She also explains that the Judas breed a single fertile male for every colony.

The herd was divided into three groups, all of which were exposed to fertile males after an initial preparation period.

For instance, the presence of a fertile male will induce an estrus cycle in a doe shortly after introduction.

As a result, he said that the "greatest mutational health hazard to the human genome is fertile older males".

Any female capable of ovulation may become pregnant after rape by a fertile male.

Once a male is sterilized, he will keep fertile males from moving in.

After pupation, these fertile males and females fly off to mate, to create the next year's colonies.