Flocking together as summer wanes, a brigade of bachelor red-winged blackbirds swings into the southbound lane, where traffic is backed up to the Arctic Circle. But where are the brownish females? Flocking apart. Red-winged congregations are strictly his or hers, except in spring when they sing, I'm ok-a-lee, you're ok-a-lee, and consort among the cattails long enough to make sure there will always be red-winged blackbirds. Then it's back to separate dorms—flocking together apart.