I looked up on the last day of July at the sound of purple martins, and instead of a swirling flock of feeding birds, I saw a line of the giant swallows flying south toward their winter home, perhaps ...

Every spring, migratory birds arrive in the continental United States from south and central America to breed. But precisely when they arrive each spring varies from year to year. In a NASA-led study ...

When Logan Parker first sees a male, black-throated blue warbler near his Maine home each spring, two things strike him about the tiny bird – its stunning appearance and the thousands of miles it ...