. The Canadian field-naturalist. 1975 Blokpoel et al.: Greater Snow Goose Fall Migration 269 were traced by hand to determine their di- rections. "Goose echoes" were large, fast- moving bird echoes travelling at a steady speed, usually on a straight course and mostly in groups. We have no proof that these echoes represented flocks of migrating Greater Snow Geese, because the targets that produced the "goose echoes" were not identified either from the ground or from aircraft. There is, however, the following circumstantial evidence: (1) all "goose echoes" came from
. The Canadian field-naturalist. 1975 Blokpoel et al.: Greater Snow Goose Fall Migration 269 were traced by hand to determine their di- rections. "Goose echoes" were large, fast- moving bird echoes travelling at a steady speed, usually on a straight course and mostly in groups. We have no proof that these echoes represented flocks of migrating Greater Snow Geese, because the targets that produced the "goose echoes" were not identified either from the ground or from aircraft. There is, however, the following circumstantial evidence: (1) all "goose echoes" came from the Cap Tourmente staging area, or the area slightly south of it (the geese have to climb to a certain minimum altitude in order to be detected by the radar); (2) there was good agreement between dates when major departures were reported and dates when many "goose echoes" appeared on the radar screen; (3) the size, range, and speed of the "goose echoes" indicated that large flocks of birds flying at relatively high speeds must have been responsible for the "goose echoes"; and (4) we know of no other bird species in the area at that time that could have caused the "goose ; NUMBERS ⢠1-20 ⢠21 - ICO ⢠101 - 500 W 501 - 2000 STAGING AREA (AUTUMN) A CAP TOURMENTE AIRPORT. 0 10 20 30 Ml. 1 'l â I ' I ' l' 'l 0 10 20 30 40 50 Km. Figure 1. Locations of the visual observations of Greater Snow Geese, tabulated in Table 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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