Monarch butterflies decline at wintering grounds in Mexico, Texas drought adds to stress to migration

Mongabay: Every fall, millions of monarch butterflies travel south to Mexico and take refuge in twelve mountain sanctuaries of oyamel fir forests. Now, declining numbers of the overwintering butterflies expose the migration’s vulnerability and raise questions about threats throughout the monarch’s lifecycle. A study published online last spring in Insect Conservation and Diversity shows a decrease in Mexico’s overwintering monarch butterflies between 1994 and 2011.

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Monarch butterflies decline at wintering grounds in Mexico, Texas drought adds to stress to migration

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