Great Spotted Woodpecker (Dendrocopos major)
Another from the window shot. Currently a lot of things are changing in our garden birds. The Siskins are back in force there are nearly always some inview and as many as 6 at a time. The amount of food being eaten by the birds has risen greatly, until recently they took 3 days to empty a tube now they empty a tube a day.
The Great Spotted Woodpecker (from now on called a GSW) hasn't been around since they were feeding young last year. I haven't heard any drumming so I doubt young are the reason for the return. When they have young they seem to pop in for a quick feed for themselves before returning to the search for suitable fledgeling food.
When drumming they manage between 10 and 40 knocks per second. Yes that is per second I haven't made a mistake. It is a good job they have a system built into their head which acts as a shock absorber. I don't recommend anyone trying to imitate a GSW. The shot by the way is of a male identifiable by the red nape (not visible in this shot but clear in some of the others).