The platypus is not listed as endangered. Platypus do not yet even qualify as threatened, although they are unofficially "vulnerable". Although very delicate creatures, sensitive to ecological changes, pollution and habitat loss, their distribution is still much the same as it was prior to European settlement, apart from in South Australia where they were wiped out last century (like many native species), being hunted for their fur. The platypus is now a completely protected species.
They aren't they are near threatened though.
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".
None, they have been extinct for a long time. None, they have been extinct for a long time.
they aren't extinct
the white tigers have been extinct since 2006
They have never been extinct. They may be endangerd due to poaching.
The Tasmanian forester kangaroo is not extinct.
Since 1921.
251(ish) years
Crocodiles are not extinct.
About 65 million years
They are not extinct, but it was close. Several thousand now live in ALaska and Canada