Both reproduction and calving take place during the winter months.

In some cases reproduction may take place without the union of the distinct individuals.

In years with lower than average rainfall, reproduction may not take place.

Human reproduction takes place as internal fertilization by sexual intercourse.

In spring and early summer, sexual reproduction takes place.

This helps structural reproduction take place in specific domains of interaction.

So there's a window there in which reproduction can take place.

As time passed, and greater interest evolved in how reproduction actually took place, research into gene structure would have begun.

As a tropical animal, reproduction is not fixed to certain times of year, and takes place twice yearly.