The Birds That Flew South

Clues in this puzzle

Across

• Expansive body of water crossed non-stop by tiny migrating songbirds (4)
• Agile, fork-tailed flyer that pursues insects thousands of miles to the tropics (7)
• Auditory check-in traded across an airborne echelon (4)

Down

• Loud autumn travelers famously seen cutting across chilly skies (5)
• Established aerial superhighway followed annually by generations of migrants (6)
• Conserve vital energy by coasting along air currents without flapping (4)
• Synchronized aerial collective banded together for safety and efficiency (5)

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