Well im here aqain answerinq one of your requested answers the population of the Chimpanzee's Declined at the day listed as October 19, 1976 !
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The serval is not an endangered species.According to the IUCN, it is listed as "Least Concern".
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It's still endangered. However, it hasn't been listed on the "Endangered Species Act", just on IUCN's Red List.
The Asian Elephant was first listed as "endangered" with the it's population decreasing in 1986 by the IUCN Red List. It is currently listed as 'endangered" by the IUCN Red List and the population is still listed as decreasing. For more details, see sites listed
they have been on the national list of most endangered species since 1989
The Red Panda was first listed by the IUCN Red List as "vulnerable" in 1994. It was then changed to a status of "endangered " in 1996. It was first studied by the IUCN Red List in 1988, but it wasn't listed due to insufficient data, until the 1994 listing. For more details see site listed below.
The Polar Bear has been on the IUCN Red List since 1982, listed as "vulnerable". The U.S. Fish and Wildlife Services, Endangered Species List added the Polar Bear in May, 2008 with a "threatened" status. So, the Polar Bear has been on the IUCN Red List for 27 years, and on the U.S. FWS Endangered Species List for almost one year. For more details, please see sites listed below.
The jaguar (Panthera onca) was listed as an endangered species on March 28, 1972.
The International Union for Conservation of Nature (IUCN) placed the Beluga Sturgeon, Huso huso, on it's Red List, as "Endangered", in 1996. The U. S. Fish and Wildlife Service (USFWS) currently lists The Beluga Sturgeon Huso huso, as "Threatened". They also have a proposed rule (67586) that, also, would finally list these animals as endangered.
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There are three different species on the US Fish and Wildlife Endangered Species List, plus one Dugong. But if you're referring to the Florida Manatee, it is listed as a State Endangered Species, but it is not list on the US Fish and Wildlife Endangered Species List.Additional Information: The West Indian Manatee, was listed by the US Fish and Wildlife Service in March of 1967, while the Amazonian Manatee, was listed in June of 1970, both have a status of "endangered". The West African Manatee was listed in October of 1979, and has a status of "threatened". For more details, please see sites listed below.ANS2:They are probably one of the most endangered species.
Only a few species of butterflies are endangered. Which species are you asking about? Each year additional butterflies are added to the endangered list.