Every pair of gravity-defying wings, each metamorphosed body and magnetic navigational system is worthy of awe. But it is the collective action of an entire population that brought us here. Butterflies, and monarch butterflies specifically, live all over the globe. But no pollinator garden, no butterfly conservatory even comes close to hosting this many winged wonders. Somewhere in these clusters is every single surviving monarch born on our backyard milkweed. These volcanic mountains hold the most spectacular example of an insect migration we’ve ever encountered.