Is that a giant disembodied bird head..? Oh, no. It's just a shimmering green opossum - that's loads more normal... okay, so green opossums are still a bit strange. Hmm.. what if its an impostor? Some sort of bird or lizard or amphibious creature, only pretending to be a marsupial... egads.
Test it?
[rate the smell of its breath]
[check the prehensility of its tail]
[get it to walk around for optimal shuffling]
[rifle through its fur for signs of scales, feathers or webbing]
This little impostor belongs to silverwolfahoo.
