. The sportsman's British bird book . districts replaces it during the than this, it has now been incontestably proved that along. or near the boundary where these two birds march, the}- not in-frequently interbreed, and it is believed that the hybrids, which some-times wholly resemble one or other of the parents, and at other timesassume an intermediate plumage, pair indiscriminately among them-selves, or with the pure stock. Hence it has seemed to some ornitholo-gists who have studied the subject, that these two birds, so longunhesitatingly regarded as distinct species, are on
. The sportsman's British bird book . districts replaces it during the than this, it has now been incontestably proved that along. or near the boundary where these two birds march, the}- not in-frequently interbreed, and it is believed that the hybrids, which some-times wholly resemble one or other of the parents, and at other timesassume an intermediate plumage, pair indiscriminately among them-selves, or with the pure stock. Hence it has seemed to some ornitholo-gists who have studied the subject, that these two birds, so longunhesitatingly regarded as distinct species, are only local races of oneand the same dimorphic species. Over a large part of Great Britain, especially the eastern countiesof England and many districts of Scotland, the crow, owing toincessant persecution by gamekeepers, is now a rare, or indeedalmost unknown bird, as is likewise the case in Ireland. Althoughgenerally supposed to differ from the rook by associating in pairs. 590 PERCHING BIRDS each of which has a separate nesting-haunt (as indeed is commonlythe case), crows sometimes collect in companies in rook-fashion. Thenest is generally
Size: 1989px × 1256px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlydekkerrichard184919, bookcentury1900, bookdecade1900
