In article , ex WGS Hamm
writes
It can see another great tit in the wiondow reflection and is attempting to
get it to go away out of it's territory. Birds often attack their reflection
mistakenly thinking they have a rival.

We once had regular visits from a couple of red legged partridges. The
male decided to attack the car. It went frantic trying to kill the other
one it saw in it!
--
Jane Ransom in Lancaster.
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