Is there any species on earth that has some form of birth control or the knowledge and ability to abort child?

Answer 1

In captivity animals can be placed on various forms of medical birth control from implants or pills, just like people.

On their own, be it captive or wild, babies are aborted all the time. Due to stress, health issues or lack of food (just like humans) the animals body has the possibility to reject the fetus causing an abortion. Some times the animals are smart enough and kill young on their own. Birds have been known to push eggs out of the next when they know they cannot care for them all or there is a problem. I once saw video of a bird of prey that was sitting on eggs. The pair was having problems finding food and they actually broken open two of the eggs and ate the chicks.... thus giving the one enough energy to go hunt and the other longer to sit on the other egg. Not sure if you would call that "abortion" but clearly the young were killed for well being of the parents and other young. This behavior can be seen in other animals too. Seen it a few times in wild cats.

Nonetheless, prebirth deaths happen often. Like I said, just like humans their bodies know that having the young wound not be a good thing. Thus the fetus is aborted.

Answer 2

I take it that you don't mean Homo sapiens. Most animals come into season once a year, which limits population expansion. At least indirectly, many animals have population control. Sometimes the availability of food limits population growth. Starlings flock together for an evening flight. The more crowded the flock is, the lower the reproductive rate will be.

Answer 3

There are many different things that influence fertility in animals. Do a little research and you should find some info. One example, when a new male lion takes over a pride, he will kill all the existing cubs. That way, it will be the cubs he fathers that survive and grow to reproduce.

Answer 4

in addition to what has aready been said, under periods of extreme stress the females will not be fertile or if they are pregnant depending on the stage of developemnt, may resorb the fetus or abort.

Answer 5

Kangaroos can delay the development of an existing foetus in seasons when conditions aren't suitable. When conditions improve, they will restart the growth of the foetus.