"Most birds do their nest-building quietly and as secretly as possible. But the rooks cannot hide theirs, so they talk about them freely. Every time they come back with a twig they shout the news to the whole rookery and to any one else who may be able to understand them. But it is dangerous for them to boast too much about a stick, for it may be stolen by a neighbour when they are gone to fetch another."
This series of photos taken on a few minutes illustrates the activity in the colony.
A Rook leaves its nest calling
This three Rooks were collecting sticks atop an Alder. The bird on the right has already got its stick.
This bird spend a good few minutes wandering aroung the tree undecided and left with nothing.
Bird returning with a branch
For this one a little twig will do