Birds?

I have no idea why my squirrel cage catches birds, but I found a 3rd one in the cage today.  I let it go of course. They sure fly out fast when I open the cage.

This time it was a titmouse.  I didn't even bother to go back to the house and get the camera.

Apparently, most birds love peanut butter.  So far, 2 sparrows and the recent titmouse.  And I guess they peck at it hard enough to trigger the cage doors to close.