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Extinction

biology
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External Websites
  • Center for Biological Diversity - The Extinction Crisis
  • National Geographic - Mass Extinctions
Britannica Websites
Articles from Britannica Encyclopedias for elementary and high school students.
  • extinction - Student Encyclopedia (Ages 11 and up)

Extinction, in extinction

extinction
The golden toad (Incilius periglenes, formerly Bufo periglenes) is believed to be extinct. It was last sighted in 1989.
Charles H. Smith/U.S. Fish and Wildlife Service
greylag. Flock of Greylag geese during their winter migration at Bosque del Apache National Refugee, New Mexico. greylag goose (Anser anser)
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environments. Indeed, current rates of human-induced extinctions are estimated to be about 1,000 times greater than past natural (background) rates of extinction, leading some scientists to call modern times the endangered coral reefs

endangered coral reefs
Map of endangered coral reefs worldwide.
Encyclopædia Britannica, Inc.
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