Causes of extinction

What are the causes of extinction?

If you've read about the different animals on the previous pages, you'll see that they have become endangered or extinct for many different reasons.

Conservation biologists - scientists who try to stop endangered species from dying out - use the word H.I.P.P.O. to remember the different things that threaten animals and plants, because each letter of H.I.P.P.O. stands for a different threat.