There are millions of insects, fish, amphibians, reptiles, birds and mammals, but only one kind of human.
Humans can also cause harm to animals, on purpose or by accident.
When humans destroy wild land to build homes, factories, shopping malls, amusement parks, garbage dumps, even to build a visitor center, store and restaurant in a park, the land is changed. The animals that once lived there, from the bugs that lived in the ground to the birds that ate them, all may disappear. Some can move to new home areas, but there are already other animals living there. There is not enough food, water or shelter for all of them. Many of the animals will die.