procreate|procreating

许多动物在春天繁殖后代。

Many animals ___procreate during the spring season.

许多鸟类在春季开始繁殖后代。

Many birds start ___procreating in the spring season.

大多数生物都有繁殖后代的本能。

Most living beings have the instinct to ___procreate.