. Bulletin. Natural history; Natuurlijke historie. MIGRATION OF THRUSHES 75 when I reached Station 1 on Caribou Brook, about a mile south of its junc- ture with York River at its southernmost bend. At 4:25 ohve-backs in small groups began flying southward through this pass toward the St. John; at 5:02 the 32d thrush was the last heard in the air. But in a small patch of spruces left unburned in the great fire of 1941, 4 olive-backs were still inter- spersing their ground notes with an occasional clear flight-call. Having recorded in 1940 evidence that, diurnally, warblers and fringillids may p
. Bulletin. Natural history; Natuurlijke historie. MIGRATION OF THRUSHES 75 when I reached Station 1 on Caribou Brook, about a mile south of its junc- ture with York River at its southernmost bend. At 4:25 ohve-backs in small groups began flying southward through this pass toward the St. John; at 5:02 the 32d thrush was the last heard in the air. But in a small patch of spruces left unburned in the great fire of 1941, 4 olive-backs were still inter- spersing their ground notes with an occasional clear flight-call. Having recorded in 1940 evidence that, diurnally, warblers and fringillids may pass almost directly southward for 8 miles up the York River between its most northerly bend at Whitehouse and its most southerly one at the mouth of Caribou Brook, it was then surmised that this was part of a longer route from the St. Lawrence via the Madeleine River and its tributary valley west of King Mountain. Confirmatory observations were made at dawn August 31, 1949 (cool, 12°C., clear, star-light plus aurora, calm to light west wind). &-\. Figure 14. One morning's thrush flight in York Valley; Whitehouse to Madeleine Fork. I reached Station 1 at 3:58 before light in the east had intensified perceptibly (Fig. 14). No calls were heard until 4:18 when the first olive- back came over from the northwest. It may have approached down the valley south of Mt. Sugarloaf, or from the north through the pass from the Madeleine Valley, and been deflected southeast by the flank of Dinner Hill. That the latter course was the true one became almost certain during the next five minutes when about 25 passed over from the north. Having thus determined the direction of flight here, I drove quickly to Station 2, where it was at once apparent that the flight as a whole was in a somewhat more easterly direction. This change was probably caused by the barrier of Mt. X on the south of the road between Stations 1 and 2, now becoming more conspicuous in the strengthening light. More than
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