Watch a Breathtaking Monarch Butterfly Swarm

In the mountains of Mexico, a spy hummingbird ventures into the heart of a breathtaking monarch butterfly swarm. Please LIKE and SUBSCRIBE if you enjoyed it! **More info & videos below** “Spy in the Wild 2 - Episode Two: The North“ premieres Wednesday, May 6, at 8|7c on PBS. --------------- For full NATURE episodes, check out Facebook: Twitter: Tumblr: