That's interesting. I wonder how he keeps his little body mass warm in the snow. I wonder what he eats.
I have a mouse regularly visiting my outdoor parakeets. He comes to eat seed from the floor of the cage. Luckily, the bars are too close for him to get into the cage. But he climbs along underneath the bottom and chews the newspaper on the bottom, to get the seeds that have fallen there.
One day I actually saw him... I was looking over at the cage, saw this cute little face and paws at the opposite side, and was thinking "how sweet," and then I thought "HOLY CRAP THAT'S A MOUSE!!! ENDANGERING MY BIRDS!!" I am hoping to all get out that he cannot find a way to actually get into the cage!