Predation is when one animal hunts another animal and eats it. It's an important part of nature because it helps to keep some animals from becoming too numerous and eating too much food or taking up too much space. However, sometimes when one species is over-predating another species, it can throw off the balance of the ecosystem, because one species can start to become more common or rare and this can affect other animals. For example, if one species of foxes eats too many rabbits, there won't be enough rabbits left for the other animals to eat, which can lead to problems for the other animals in the area.