The most beautiful thing you’ll see today

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In the mountains of Mexico, a spy hummingbird ventures into the heart of a breathtaking swarm of half a billion monarch butterflies. It represents no threat as they, too, feed off sap, and butterfly feel confident enough to sit on its wings.

“Spy in the Wild 2 – Episode Two: The North“ premiered Wednesday, May 6, at 8|7c on PBS.