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What is causing the decline in monarch butterfly populations?

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A new census found this winter's population of North American monarch butterflies in Mexico was at the lowest level ever measured. read more

Tracking the Causes of Sharp Decline of the Monarch Butterfly A new census found this winter’s population of North American monarch butterflies in Mexico was at the lowest level ever measured. Insect ecologist Orley Taylor talks to Yale Environment 360 about how the planting of genetically modified crops and the resulting use of herbicides has contributed to the monarchs’ decline. read more

Loss of habitat, primarily it's only food source--milkweed. Adults have a varied diet, but the caterpillars exclusively eat milkweed. It's widely believed that certain things in milkweed allow its development into a mature butterfly. read more

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