http://sciencenow.sciencemag.org/cgi/co ... 2009/924/2
By Cassandra Willyard
ScienceNOW Daily News
24 September 2009
'Each fall, hundreds of millions of newly hatched monarch butterflies flit from the fields and forests in eastern regions of Canada and the United States to the alpine fir forests of central Mexico, converging on the same spot to wait out the winter. Scientists don't know exactly how these insects find their way, but a new study shows that, to navigate, the butterflies rely on biological clocks. Oddly enough, the clocks are located in their antennae, not in their brains as previously thought.'
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