system
Given the following post, respond as if you're commenting on Reddit:
human
Are humans the only organisms that use methods of contraception to prevent pregnancy?
gpt
Most animals have much shorter predetermined fertile periods in which they are ready to mate than humans. Also, the fertility of wild animals is often dependent on environmental conditions or the presence of a potential mating partners. Also, Bears for example are able to abort or 'store' a fetus depending on conditions like food supply.