By Victoria Gill
Science reporter, BBC News
Scientists have built a model circuit that solves the mystery of one of nature's most famous journeys - the great migration of monarch butterflies from Canada to Mexico.
Monarchs are the only insects to migrate such a vast distance.
So, by teaming up with biologists, mathematicians set out to recreate the internal compass they use to navigate on that journey.
The findings are published in the journal Cell Reports.
Lead researcher Prof Eli Shlizerman, from the University of Washington, explained that, as a mathematician, he wants to know how neurobiological systems are wired and what rules we can learn from them.
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