Rook (Corvus frugilegus)
The Rook has this distinctive 'bony' look to its beak where as the Crow has a totally black beak.
Another feature is that the Rook is much more untidy in appearance and has baggy short trousers! The Crow is a much more sleek creature all round.
Rooks are very gregarious and are raely seen in small numbers and often flocks are boosted by large numbers of Jackdaws as well. It is difficult to know whether the Jackdaws tag along with the Rooks or whether the Rooks like the company of Jackdaws. Whichever way, mixed flocks of well over 500 are quite common and when they take to the sky the noise can be deafening!
By January Rooks are already thinking about nesting and can be seen circling around their favoured nesting site, or Rookery, as again they nest in social groups.
I can't imaging what it is like to live near a Rookery! Is there any peace?