Introduction of Foreign Species
When foreign species are introduced into an area like Brazil, they cause shifts in the balance of the existing eco-systems. They eat too much, or they require vegetation (which then has to take the place of the existing plants), they move in different patterns and they are hunters or prey, which changes the behaviour of the indigenous animals. Native species can extend to include plants and microorganisms as well as animals. In Brazil, some of the alien species include water buffalo, wild boars, the giant African snail, Black wattle, bamboo, thistles, Australian pine and bananas.