Many animal species are at risk of becoming extinct, or dying out. Although natural causes can be a factor, humans are largely responsible. Activities such as logging, farming, and construction have destroyed many animal habitats, and illegal hunting has only added to the problem. A group called the International Union for Conservation of Nature (IUCN) surveys different animal populations to determine if they are at risk.
Term Part of Speech Definition Encyclopedic Entry critically endangered Noun
level of conservation between "endangered" and "extinct in the wild."
endangered species Noun
organism threatened with extinction.
Encyclopedic Entry: endangered species extinct Noun
no longer existing.
environment where an organism lives throughout the year or for shorter periods of time.
Encyclopedic Entry: habitat pesticide Noun
natural or manufactured substance used to kill organisms that threaten agriculture or are undesirable. Pesticides can be fungicides (which kill harmful fungi), insecticides (which kill harmful insects), herbicides (which kill harmful plants), or rodenticides (which kill harmful rodents.)
to hunt, trap, or fish illegally.