Vauxs Swifts at Chapman Elementary School The Chapman swifts - TopicsExpress

Vauxs Swifts at Chapman Elementary School The Chapman swifts are part of a migratory population of Vauxs Swifts that roost seasonally in the chimney of Chapman Elementary School in Portland, Oregon. This is North Americas largest concentration of Vauxs Swifts.[4] Every evening from mid-August to mid-October, thousands of swifts gather in the sky over the school shortly before sunset. Count estimates of 1,700 to 35,000 swifts have been reported. Shortly after sunset, over a period of 10 to 30 minutes, they fly into the top of the brick chimney (constructed c.1925) to roost on the interior surface until they depart at sunrise.[5] The school is on the birds migratory route to their wintering sites in southern Central America and Venezuela.[6] The swifts attract several predators, such as Peregrine Falcons and Coopers Hawks, as well as hundreds to thousands[5][7] of human spectators.[8] - Wikipedia en.wikipedia.org/wiki/Vauxs_Swift

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