Larval caterpillar of a monarch butterfly actively eating the green pod of a milkweed plant, with focus on the head of the caterpillar Monarch Butterfly on Blue Salvia with Crysalis and caterpillar ...

Monarch butterflies—including western monarchs, who winter in California and spend summers west of the Rockies—were recently proposed for listing as threatened under the Endangered Species Act.

Monarch butterflies are among the most studied insects in the world due to their impressive seasonal journeys across North America. Yet, their populations face mounting challenges as climate change ...

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