Tasmania - The island state is one of the world's major suppliers of licit opiate products. The government maintains strict controls over areas of opium poppy cultivation and output of poppy straw concentrate; major consumer of cocaine and amphetamines.
Monotremes are uniquely Australian, so using the colloquial idea of 'true blue' I am guessing it's a monotreme. Of the monotremes known to currently exist the platypus tends to have a bluish beak as well. So my guess is the platypus.
Although this is a history thread, so it's prolly something well and truly extinct.
That's a very good bit of reasoning, Sarn. The animal is not a monotreme, though. It is not extinct, either. The colour is not strictly blue, but is very rare on a mammal.