LYCOS RETRIEVER 
Butterflies: Monarch Butterflies
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Vermont State Police are investigating the recent destruction of a private stand of "Bt corn," a crop genetically altered to produce a pesticide thought to be harmful to monarch butterflies. Literature opposing the use of Bt corn was left at the scene, according to news reports.
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A consortium of federal, university and industry scientists led by the Agricultural Research Service has completed two years of research to answer the question: Does Bt corn pose a threat to monarch butterflies? The answer, supported by science, is that there is no significant risk.
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Many butterflies, such as the Monarch butterfly, are migratory and capable of long distance flights. They migrate during the day and use the sun to orient themselves. They ... perceive polarized light and use it for orientation when the sun is hidden.[31]
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Monarch Butterflies