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focusing binoculars or telescopes on a full moon on a clear September night, one may be lucky enough to see tiny specks move across its face.
Once in the air at 7,000 feet, the birds will stay aloft until they encounter high winds that bring them down to the tree tops to feed until a favorable wind tells them to move on through the corridor without, walls. Flying against strong winds uses too much energy and the burning of stored fat.
Many birds that nest in central and western Canada move east, then turn south and follow the coast of New England. Mixed flocks of songbirds congregate on Long Island and wait for favorable winds before mounting the air.
In a recent breakthrough in the study of migration, a large mixed flock of warblers, thrushes, and vireos — and Rose-breasted Grosbeaks — was tracked by radar. The birds left Long Island and climbed to a cruising altitude of 7,000 feet. On occasion, they ascended to 20,000 feet to ride favorable winds. From Long Island to the coast of Venezuela, the birds remained in the air over open water for 86 hours.
Before starting south, birds gorge on berries and insects increasing their weight by as much as 50 percent. Layers of fat accumulate on the breast and under the wings. This fuel keeps them going for hundreds of miles in the non-stop flight
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