One confused bird this one, continually jumping up on this car mirror then back down to peck at the mirror and back again and again and again, and so this went on for several minutes until it took flight, only to come back and repeat the exercise. I’m sure if I go out now its still at it. Looking at similar reports, whilst amusing, it appears that the bird thinks its reflection is an intruder so pecks at the mirror , especially at this time of year when they are thinking of pairing up with a mate and getting territorial. It has been known for glass to be broken during this exercise and really isn’t good for the bird as it gets quite agitated. Solution, cover your mirror with a bag to remove the reflection or hope it finds a mate soon.