Arrested Development - Ex-Pats Mexico

Researchers at the University of Massachusetts Medical School say 40 genes are responsible for the monarch's 4,000-km journey from Canada to Mexico.
"Our data are the first to provide a link between gene expression profiles in the brain and migratory state in any animal that undergoes long-distance migration," ScienceDaily quoted Reppert as saying.
The study found that the monarch uses an internal clock and a 'sun compass,' which senses the angle of the sun, to find its way south every fall.
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