Dancing Around the Four Sides

So far the wrens have proven to be much smarter than the sparrows who used to come in the house occasionally -- they poke around for a little while (never beyond the alcove by the back door), seem to decide this isn't really very interesting, and fly out again. Amazingly enough, they've never pooped on anything.

The sparrows would immediately panic and fly all the way to the front of the house, where they'd get tangled up in the curtains. Idjits.