Platypuses are not endangered.
Currently, they do not qualify as threatened, nor Near Threatened, nor prior to 2001 as Conservation Dependent.
The Australian Government lists the platypus as "common but vulnerable".
Platypuses have never been endangered. Even when they were close to extinction in the early 20th century, they were not classified as endangered, as this was before official conservation measures were in place.
Platypuses do not need to be in a zoo. They thrive in their native habitat, and they are not endangered. Zoos are not good places for platypuses as it is still rare for platypuses to breed in captivity.
Platypuses are not endangered; nor have they ever been categorised as endangered. They reached a state of near-extinction by the early twentieth century, but this was before official protection measures came in, and therefore it was also before conservation status was allocated to certain species. Currently, platypuses do not qualify as threatened, nor Near Threatened, nor prior to 2001 as Conservation Dependent. The Australian Government lists the platypus as "common but vulnerable".
Not at all as of 2013 platypuses are not on that list.
It is not generally known that fossil evidence indicates there were once platypuses in South America, although these creatures had teeth, unlike modern platypuses. It is unknown why platypuses became extinct in South America thousands of years ago.
the ocelot has been endangered since 1972
"Duckbill" is not the correct term; nor are they extinct. Platypuses are not even classified as endangered in 2014.
Manatees have been endangered for about 20 years now.
it has been on the endangered list for 5 years
Platypuses are not soon to be endangered. Currently, they do not qualify as threatened, nor Near Threatened, nor prior to 2001 as Conservation Dependent. The Australian Government lists the platypus as "common but vulnerable".
they have been classed as an endangered species since 1972
Platypuses do not have an official listing of "endangered", so the answer to the question has to be 'no'. However, they are threatened by pollution, as are all members of the animal kingdom in one form or another. Unlike sea animals, platypuses do not ingest plastic bags and floating rubbish, but they are sensitive to chemical changes in the water in which they feed.