Notes on the Rook: with special Reference to the proportion of young in flocks, and the change over from the winter roost to the Rookery

A recent book, The Life of the Rook, by G. K. Yeates, makes one realize how much remains to be known about this bird, and emboldens me to give a summary of notes I have taken. There is a small rookery at my house. I t is not a winter roost. The number of nests reached 54 in 1931. This number has not varied since then by more than one and in 1934 was 54. In 1933 a new rookery, most probably an offs...