Who's that knocking at my door?

Socks says someone is at the door. I don't see anyone, Socks. "Really!" she says. "I'm telling you there IS someone there!"
So I look out the kitchen window into the cold afternoon.
Oh. Someone is out there. Only it is such a small someone that I didn't see it at first!

"It's cold out here," says little 'Possum. "Can't I come in?"
Uh, no, I don't think so...