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A northern rough-winged swallow alighted on a branch and Mr. Cooper, 57, trained his lenses on it for a while.

Four birds have been elusive: the hairy woodpecker, bank swallow, cliff swallow and northern rough-winged swallow.

Group members responded to van den Broek’s question by listing the names of the birds they had spotted - a chickadee, a kingfisher, a rough-winged swallow.

Only their cousin, the rough-winged swallow, whose breast is brownish gray, is so plainly dressed.

The rare rough-winged swallow deigns to linger and nest in the Park as well as do his more common brethren.