Binro the Heretic How far back in mammalian evolution does the "skritchy spot" go? Do we all share a common skritchy ancestor or is this a case of convergent evolution?
Syd Midnight Common ancestor, because birds and certain reptiles have it too. You can even give scratchies to a parakeet if it really really trusts you.
Sanest Man Alive Clearly, in prehistoric times the earth was visited by aliens who created all modern animal species (including humans!) to be companions for their hyperadvanced society's children and lonely/nutty old ladies. I'll be compiling all these assumptions, unchecked facts, folk legends and outright flim-flammery into a book entitled "Pursepets of the Gods?"
Jet Bin Fever Now I want to see that platypus scene from Dot and the Kangaroo.