Pine Martin.

Our des-res sports a significant amount of interesting wild life, including this pine martin though, as my pictures showed, there are at least two of them who appear here regularly to feast on the bird fat balls. It’s all down to the marks on their bibs.
 
They are noisy and messy eaters with their contortions while fighting  the food containers causing both their good selves and said containers to bang on the window - and their slobber to spread a disgusting layer of mixed ingredients over the glass. Only a few short hours previously, the window cleaner had conscientiously left it in immaculate condition.
The blip shows the animal judging his leap up to the food.

p.s.  Just posted yesterday's, "Family Life."