Going, Going Gone?Version en ligne
par Elvia Maria Sian Figueroa
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More than 18,000 species are believed to be in danger of extintion.
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About one-fourth of the world's species have disappeared since 1970.
3
Aurochs had gone extinct by the early 1600s.
4
The passenger pigeon once populated the western U.S. and Canada.
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At present, the mountain gorilla is considered vulnerable.
6
The habitat of the polar bear is in the southern hemisphere.
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Whooping cranes have made a partial recovery.
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