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    Monarch Butterfly Navigation
    From: Bob Goethe
    Date: 2016 Apr 19, 10:29 -0700

    Turns out that being able to measure time accurately is important not just in human-navigation.

    http://www.bbc.com/news/science-environment-36046746

    Scientists have ...solve(d) the mystery of one of nature's most famous journeys - the great migration of monarch butterflies from Canada to Mexico.

    ...two control mechanisms - one based on the timekeeping "clock" neurons in the butterflies' antennae and the other from what are called azimuth neurons in their eyes. These monitor the position of the Sun.

    "The circuit gets those two signals then matches them, according to how it's wired, to control signals that tell the system if a correction is needed to stay on the correct course," explained Prof Shlizerman.

       
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