Science: The Migratory Butterflies

A favorite mystery of nature lovers is the behavior of the showy, black-and-orange Monarch butterflies, which appear to fly south in fall like migratory birds. Many authorities have doubted that insects have the brains and endurance to make a real migration to avoid the northern winter. The strategy of most insects is to sit out the winter as eggs or pupae. Last week Dr. Frederick Urquhart, director of Toronto's zoology museum, told about a 19-year study that tends to prove that Monarchs do migrate.

In 1938 Dr. Urquhart, then a young zoologist on the museum's staff, began trying to label Monarch butterflies...

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