The precise mechanisms monarch butterflies use to navigate over long distances has always been an entomological puzzle. A combination of the sun’s position relative to the horizon, light-sensitive time-compensating “clocks” housed in the antennae, photosensitive ommatidial unit receptors in the compound eyes, and brain dodad called the anterior optic tubercle all work together to control the monarch’s in-flight navigation.
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How do migrating butterflies know where they’re going?
