Butterfly's Navigation Secret Revealed in Flight Simulator - Yahoo! News

Butterfly's Navigation Secret Revealed in Flight Simulator - Yahoo! News: "The monarch butterfly is known to use the angle of sunlight as a navigational guide on its annual fall migration from across North America to Mexico. But how it processes the information has been a mystery.

Now scientists have used a flight simulator and peeked inside the butterfly brain to learn that their light-detecting sensors are hard-wired to their circadian clocks, allowing the creatures to compensate for the time of day."