"jay jay" wrote in message
...

we have a great tit which keeps knocking its beak on two small windows
in the attic and appears to be desperate to get inside. Its been
around for a few days, regularly tapping away around 8.00am. I
wondered if it might be trying to nest in here - but not at this time
of year? We had the attic converted a couple of years ago when we came
to live here permanently - until then the 'windows' were just openings.
Does anyone know how long great tits live, and why this one is trying to
get in?

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.