There is a bird living locally that sits on window sills and taps its beak repeatedly against the glass. This has happened just now to me. I heard the tapping went to look but the cat beat me to it and it flew off to repeat the performance across the road. Can anybody explain why it is doing this. The only thing I can think of is that it sees its reflection as another bird and trys to peck it.
Depends on the bird... some males are territorial and will attack what they think is a competitor some birds especially some robins and blackbirds have learned to tap for food...had a robin that used to do this... if its fairly gentle tapping I'd go with the feed me option and get some meal worms to encourage it