In Portland, Thousands Gather To Marvel At Migrating Birds’ Nightly Routine
"The Vaux's Swift is a tiny bird – some people call it “a cigar with wings.” But every fall these little birds make a big trip, from summer breeding grounds in the Pacific Northwest down to their winter home in Central and South America. Along the way, many of them roost as a big flock in chimneys up and down the west coast. And their murmurations in the air – and simultaneously dive together into chimneys – are so spectacular that they draw crowds."