A Portmanteau That Really Fits the Bill

What a fun portmanteau word; however, according to Australian-Wildlife.com, there is no other type of platypus so the term "duck-billed" platypus is redundant.

Another linguistically interesting fact from Australian-Wildlife.com is that "there is no agreed term for the plural of platypus, with platypus, platypoda and platypuses all being used."