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

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.

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

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