Every September millions of migrating Monarch Butterflies fly the sky road clocking over a hundred miles a day to a winter destination in Central Mexico where they will end their remarkable nine-month life cycle. Where do they go exactly? Why do they do it?
First, there are a few, then hundreds, quickly followed by thousands. Soon the sky is dotted with over a million bats off on their nightly forage for food. They are cheered on by hundreds of spectators who crowd the Congress Avenue Bridge in Austin. Hundreds more line the banks of Lady Bird Lake, and even more watch from tour boats in the water.