. Bulletin of the British Ornithologists' Club. In neither case were there audible wing claps, such as occur in high intensity display flights of all other pigeon species whose display flights are known to me. Possibly these two display flights of C. plumbea that I saw were at low intensity but I had the impression that the situation was rather that in this species the threshold for performing the display flight was relatively high. It seems possible that this species may, in an evolutionary sense, be in process of losing this Please note that these images are extracted from scanned
. Bulletin of the British Ornithologists' Club. In neither case were there audible wing claps, such as occur in high intensity display flights of all other pigeon species whose display flights are known to me. Possibly these two display flights of C. plumbea that I saw were at low intensity but I had the impression that the situation was rather that in this species the threshold for performing the display flight was relatively high. It seems possible that this species may, in an evolutionary sense, be in process of losing this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : British Ornithologists' Club
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