Humans also alter the environment of species by changing the plant life in the area and population of air and water supplies around the species. Clearing land also causes a major extinction of animals and plant life living in an area. Humans also introduce other species to areas that cannot hold these species, like bringing over domestic dogs from Europe. Certain species simply cannot survive in certain surroundings. Many humans also have been killing animals for no reason but sport.
Hunters also kill animals for special items.
An example of this would be when hunters kill elephants for their ivory tusks. Humans set fire to areas for agriculture to be grown, but in the mean time the plant life is being destroyed. The animals that live in that particular area are forced to leave or die. These extinction occurred shortly after the first arrival of prehistoric humans. The carnivores on this list weren t hunted directly, but were dependent on the large herbivores for food.