In a forested region of Angola where a cliff separates the landscape, a new species of butterfly was discovered. /iStockphoto ...

The outlook for butterflies in the U.S. seems as fragile as their delicate wings, as a study reveals the population of 554 ...

The U.S. butterfly population — not just Monarch butterflies — declined 22 percent in two decades, according to ...

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The butterflies’ resilience shows that some species are capable of adapting to dramatic changes in climate, food availability and urban development.