. The Canadian field-naturalist. 168 The Canadian Field-Naturalist [Vol. 64. Table 3. SUMMER FLOCK COUNTS OF BIRDS BY SPECIES Fig. 2b. Southern part of area trovelled ond averages by sections. Underlined figures are return-trip overages. gration movement. On August 1, I saw six Yellow-shafted Flickers in a flock; previous- ly the birds had been in singles or pairs and rarely three or four. Bohemian Waxwings were noted in singles and pairs until July 17 when I counted forty-five in a flock. The first definite flocking tendency and mi- gratory movement of the Nighthawk oc- curred together on Aug
. The Canadian field-naturalist. 168 The Canadian Field-Naturalist [Vol. 64. Table 3. SUMMER FLOCK COUNTS OF BIRDS BY SPECIES Fig. 2b. Southern part of area trovelled ond averages by sections. Underlined figures are return-trip overages. gration movement. On August 1, I saw six Yellow-shafted Flickers in a flock; previous- ly the birds had been in singles or pairs and rarely three or four. Bohemian Waxwings were noted in singles and pairs until July 17 when I counted forty-five in a flock. The first definite flocking tendency and mi- gratory movement of the Nighthawk oc- curred together on August 1 when a flock of fifteen passed over. I am unable to say what initiated the flock assembling, but it probably came about with the decline of daylight that was so notice- able in mid-July. The gonads of birds col- lected then were small compared to earlier, even though young birds had just left the nest and the breeding season was not yet far behind. Evidently the gonadal regression is extremely rapid in the Northland. But it was not until the Cliff and Bank Swallows left so dramatically on the morn- ing of August 3 that one became conscious of the passing evidence of summer and the coming of fall, even though it was early August. The congregating of birds for the faU migration became clearer after that, but the silence that followed the cessation of breeding activity blanketed the land and pressed upon the ears that strained to catch sounds in the soundless landscape as the eyes strain to see in the dark. Loon Canada Goose Baldpate Greater Scaup Duck Barrow Golden-eye Bufflehead White-winged Scoter Surf Scoter American Merganser American Rough-legged Hawk Redtailed Hawk Bald Eagle Marsh Hawk Golden Eagle Sparrow Hawk (Kestrel) Blue Grouse (brood) Spruce Grouse (brood) Killdeer Spotted Sandpiper Lesser Yellowlegs Semipalmated Sandpiper Least Sandpiper Herring Gull Bonaparte Gull Horned Owl Nighthawk Kingfisher Yellow-shafted Flicker Arctic Three-toed Woodpecker Trail Flycat
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