The index of Heron population, 1937

FOR the fourth year in succession* we were able in 1937 to keep accurate record of the fortunes of a large part of the breeding population of Herons {Ardea c. cinerea). It can hardly be said that the results have been dramatic. In England and Wales as a whole the Heron does not appear, over this period, to have been markedly increasing or decreasing, or to have been spreading or contracting its ra...