Rook-ing around the Christmas Tree

OK - wrong season, but the weather doesn't seem to know what season it is either! - blowing a gale and sooooo cold!
These rooks like to visit my garden to steal food put out for smaller birds and it's quite comical to watch them working out how to get a tasty morsel without crash landing! but as soon as I try and capture them on camera they retreat to the high fir trees.