Endangered SpeciesThousands of plants and animals are endangered, and thousands more are threatened. Many of the reasons certain animals are disappearing forever are because of human activities.
Five Major CausesThe mnemonic HIPPO represents the five major causes of declining wildlife biodiversity:
H - Habitat Loss
I - Invasive Species
P - Pollution and Pesticides
P - Population Growth (human) and the Pet Trade
O - Over-hunting and Over-collecting