The critically endangered language belongs to the Tupi language family. As of 2007, there was only one remaining speaker.
Bangladeshi conservationists said this week that the discovery of the rare leopard, captured by villagers, renewed hopes for the survival of the critically endangered species.
All four subspecies of gorillas are listed as endangered or critically endangered by the International Union for Conservation of Nature.
Three of the four gorilla subspecies are already considered critically endangered, and the fourth is listed as endangered on the IUCN Red List of Threatened Species.
Six of the seven known sea turtle species are listed as vulnerable, endangered, or critically endangered on the International Union for Conservation of Nature's red list of Threatened species.
The critically endangered golden lion tamarin is named for its striking orange mane.
Nevertheless, Prof Barnosky said it was not too late to save these critically endangered mammals and other such species.
Mark told me at our first meeting that he believes whichever eight critically endangered species they had chosen back then, the chances are that a quarter would now be extinct.
Despite the baiji's critically endangered status, Mr. Pfluger felt that not enough had been done to save it.
These include nearly 100 species of lemur, six of which are deemed critically endangered.
But we also found an enormous number of critically endangered species.
The animal is listed as critically endangered, with just a few hundred thought to exist in the wild.
Among the critically endangered species are the western lowland gorilla and the bactrian camel. The golden-headed lion tamarin is listed as endangered and the socorro dove is extinct in the wild.
The Chinese year of the tiger saw contrasting fortunes for Asia's most famous animal which remained critically endangered in the wild despite an unprecedented international conservation push.
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