We have a Squirrel on the forums. Can someone be "The Platypus" and use that as their avatar? EDIT: Not volunteering...
What has your research shown? How did you identify the ass-end to check the movement? Is it an egg-layer or an automatic? Would you call these questions... platitudes?
I don't think it is a beaver...….I've seen a hirsute beaver or two, and none have looked liked that, upclose and personal or otherwise. I vote duck.
OK.....I was qualifying my response when you posted!! And to quote a great MP sketch….."wink, wink... nudge, nudge....say no more...."