Every spring, it happens. A flash of steel blue and russet, a deeply forked tail streaming behind it, low and fast over a field — and you know. Winter is done. The swallows are back.

But the swallow's story is so much bigger than that moment. Today we're covering the migration — a 6,000-mile journey across the Sahara. The nest built one mouthful of mud at a time. And why a bird that weighs less than an ounce is quietly telling us something about the state of half the planet.

This is BIRDZ. I'm Wren.

Remember to look out and look up.

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