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The Japanese sea lion and Caribbean monk seal disappeared in the 1950s, the most recent aquatic mammals to become extinct. Several land-based mammal species and subspecies have disappeared since then. If the baiji is extinct, the vaquita (Phocoena sinus) has become the most endangered marine mammal species. Some scientists retain hope for the ...
2. Baiji Dolphin (Lipotes vexillifer) Known as the Yangtze river dolphin, or the Chinese lake dolphin, the Baiji was declared functionally extinct in 2007. This was announced after a dedicated six ...
The Yangtze Freshwater Dolphin Expedition 2006 (Chinese: 长江淡水豚类考察) was a six-week search expedition undertaken in November and December 2006 in Central China in an attempt to locate continued proof of the existence of the endangered baiji Yangtze dolphin (Chinese river dolphin).
After returning to the United States in 1922, Hoy was commissioned by the US national museum to return to China. Prior to his death in China, he became the first occidental researcher to obtain a baiji, the river dolphin Lipotes vexillifer, a rare species that was later declared extinct. [2] [5]
Despite the world's last captive thylacine dying in 1936, the secretive animal wasn't declared extinct until 1986. More recently in 2007 the Baiji dolphin , a rare river dolphin native to China ...
Recently extinct mammals are defined by the International Union for Conservation of Nature (IUCN) as any mammals that have become extinct since the year 1500 CE. [1] Since then, roughly 80 mammal species have become extinct.
These animals numbers went into freefall from the combined effects of accidental catches during fishing, river traffic, habitat loss and pollution. In 2006 the baiji dolphin became extinct; the world lost an entire genus. [88] In 2020, a sweeping law was passed by the Chinese government to protect the ecology of the river.
The subspecies became globally extinct in the wild after the last wild animals were hunted in Poland during World War I, but survived in captivity. [82] It was reintroduced to the Altai in 1982-1984. [71] Arabian oryx: Oryx leucoryx: Arabian Peninsula Extinct in the wild in 1972 and reintroduced in Jiddat al-Harasis, Oman in 1980. [83]