We have a greenhouse window in our kitchen. For no reason I could figure, back in July our resident California towhee spent several minutes walking around on the slanted glass top and pecking the glass, back in July. Here he is, walking on the glass:
He even flapped around but never flew off:
Sometimes he just stood there and stared in:
It’s very unnerving to sit alone in a house and hear something tapping in an empty room! Glad it was only him.