We have the usual Hummingbird feeder out on the patio, and it hangs at the very far corner of the patio cover. (20 feet from the door?)
But those little buggers race around under the patio cover sometimes............ and find the glass door.
We never heard the impact today, but they can ring against those dual pane windows, then the wife found him right outside by the step. He was dazed and confused, but sat there for a while and shook it off, took about ten minutes or so and he finally flew away.
