Tree rat.

Is what squirrels are sometimes called, but here, this is an actual rat (or possibly a big water vole) helping itself to a bird feeder. It had young to feed, so is excused. 
These are all from our walk round Arlington Court (please see third extra.)
1st extra: Fine furled fern. 
2nd extra: Siskin (though I'm probably totally wrong) nipping in between rat raids.