Two Centuries of Monarch Butterflies Show Evolution of Wing Length (IMAGE)

University of California - Davis

Two Centuries of Monarch Butterflies Show Evolution of Wing Length

Caption

Monarch butterflies are known for their lengthy migrations, but in some cases the insects have spread outside their normal range and settled in non-migrating populations. These non-migrating butterflies consistently have smaller wings (bottom, collected in S. America) than migrators (top, collected in San Francisco).

Credit

Micah Freedman, UC Davis

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