When does the fall migration often see larger concentrations of Whimbrels on the New England coast?
Answer
Late summer and early fall
Observation patterns on the New England coast show a distinct difference in concentration levels between the spring and fall migratory movements. The text indicates that the fall migration period typically results in larger concentrations of Whimbrels compared to the spring passage through that same area. This autumnal build-up suggests that the birds are engaging in heavy feeding to fuel up for the long, arduous journey southward. Consequently, the most reliable window for coastal observation in the Northeast to view these large gatherings is during late summer and extending into early fall, often yielding better results than monitoring the earlier spring passage.

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