I believe the platypus is doing very well compared to many Australian animals which seems to show how hardy it can be given its unique biology and considerable threats to many of its river habitats (due to regulation, over-extraction, pollution, weeds, introduced fish that disrupt aquatic ecosystems etc etc). They probably have reduced significantly in numbers since European settlement but there is insufficient data to prove levels of decline except that they have disappeared or are rare in some rivers. Nevertheless, its conservation status is not threatened as numbers have probably stabilised in recent times (or are at least not significanty reducing), some threats have gone (e.g. hunting), and comebacks are apparent in some rivers (although that may be partly due to extra survey effort). Others may know more exact details.
