Monarchs may navigate using clocks in their antennae.
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References
Merlin, C. et al. Science 325, 1700-1704 (2009).
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Urquhart, F.A. The Monarch Butterfly (Univ. Toronto Press, 1960).
Merlin, C. et al. J. Biol. Rhythms 22, 502-514 (2007).
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Buchen, L. Butterflies' migrational timekeeper found. Nature (2009). https://doi.org/10.1038/news.2009.946
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DOI: https://doi.org/10.1038/news.2009.946