Most males Spock's age had long ago con-summated their engagements and produced children.

Waterside residents have been known to be kept awake by the buzz, which the males can produce continuously for an hour or more.

In some species, adult males can also produce light.

Adult males produced this disruptive behavior with varying intensity, which depended on the situation.

Over the next few hours, the male will produce the spermatophylax and attach it to the female's ovipositor.

This system developed because strong males will produce young which have a better chance for survival.

During play, young males produce early attempts at the trill call, which show high degrees of variability.

When they find water, the males produce a mating call that attracts female toads.

During this time, both males and females usually produce more testosterone than at any other time in life.