Since Humans have been on the earth they have been building things that they think is right for humans but they often forget what they are doing to the environment. Many forests where many animals and species have been destroyed for a place for humans, many 1,000 animals get killed each year because of humans changing the environment. When the environment changes, animals have trouble readjusting even if they are relocated. The food they once ate whether it be plants or animals will be different, a lot of times resulting in the animals demise. If the animals don't get the food they need they will eventually turn extinct.