Sun clocks in as migration key.
The mechanisms by which some animals are able to achieve astonishing feats of migration have often eluded researchers because of the difficulty of designing suitable experiments. Two Canadian researchers believe they now have a set-up to throw light on the flight of the monarch butterfly. Nigel Williams reports.
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D000818:Animals; D001522:Behavior, Animal; D002080:Butterflies / Q000502:physiology*; D004641:Emigration and Immigration; D010507:Periodicity; D012621:Seasons; D013472:Sunlight; D013696:Temperature