When Scrooge wakes up after weird dreams and looks out of his window onto the snowy Dickensian scene bellow, he asks a little urchin what day it is, then tells him to go to the butcher's shop, purchase the last remaining turkey, etc etc etc.
Then, when Ebeneezer heads of to the Cratchets, whilst wandering through the deep, crisp, white snow, wishing all and sundry a "Merry Christmas"
swifts can be clearly heard screeching overhead.