More monarch butterflies

There was an article in Tuesday's Times about Monarch butterflies. They are pretty neat, because they migrate across the country, and are the only animal (other than humans) who can navigate by both longitude and latitude. Bees, incidentally, can navigate based on the sun, they do a dance when they return to the honeycomb to indicate where good flowers are. The butterflies are even neater, I think, because they are able to navigate across the country. If you move them (say, from Kansas to Washington, DC), they are still able to reorient themselves and figure out where they are and fly off in the right direction.