A sun compass in monarch butterflies

@article{Perez1997ASC,
  title={A sun compass in monarch butterflies},
  author={Sandra M. Perez and Orley R. Taylor and Rudolf Jander},
  journal={nature},
  year={1997},
  volume={387},
  pages={29-29}
}

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...

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In the late summer of 1940, there was a decided peak in the abundance of the monarch butterfly, Danaus plexippus L. Numerous reports were received by the Royal Ontario Museum of Zoology, and a

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Monarch butterfly orientation: missing pieces of a magnificent puzzle

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    The Journal of experimental biology
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TLDR
A new hypothesis is presented that the orientation of adult monarchs undergoes a continual clockwise shifting throughout the 3-5 generations, rotating by 360 in the course of the year, consistent with the timing of arrivals and the relative abundance of the successive generations of monarchs throughout eastern North America.