One of the most famous bird migrations in the world is scheduled for its latest chapter today — the traditional day the swallows leave the mission at San Juan Capistrano in California. After circling the old mission, the birds fly 6,000 miles to Goya, Argentina to spend the winter. They return in the early hours of March 19, a few days after some scout birds arrive to check out the area. Their arrival is celebrated by a big festival and parade, attended by people from all over the world. The migration has been noted since 1776, when the mission was built. Nearly 14 million Americans across the country enjoy bird watching annually. You can find more facts about America’s people, places and economy from the American Community Survey at <www.census.gov>.