This document discusses several endangered and extinct animal species. It provides information on white sturgeon, Sumatran orangutans, Pinta Island tortoises, ivory-billed woodpeckers, and Javan tigers as almost extinct or recently extinct animals. The document also discusses reasons for species extinction like human hunting, habitat destruction, pollution, and pesticide use. It explains problems with species extinction such as imbalances in food chains and loss of genetic diversity. Tips are provided on actions individuals can take to help endangered species like donating, volunteering, and practicing population control.