An American Flag flies in the distance as a rare snowy owl looks down from its perch atop the large stone orb of the Christopher Columbus Memorial Fountain at the entrance to Union Station in Washington, Friday, Jan.... About every 3 to 5 years, a spike in the population of lemmings, their chief food source, results in a larger number of surviving owl chicks.... A rare snowy owl looks down from its perch on a marble eagle of the Christopher Columbus Memorial Fountain at the entrance to Union S