Every autumn, as the leaves blush and gold across the Northern Hemisphere, the skies transform into a living tapestry of motion. Billions of birds—from the Arctic Tern’s 44,000-mile round-trip to the Sahara, to the Ruby-throated Hummingbird’s solitary 500-mile crossing of the Gulf of Mexico—embark on journeys that defy human comprehension. They arrive at breeding grounds […]