monarch cluster

More than 100 orange, black and white butterflies clustered together hanging on tree

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Up close, the clusters are full of color. Monarch butterflies clustered on a Monterey cypress branch at the Monarch Butterfly Santuary in Pacific Grove, Calif. Arriving in October, monarch butterflies cluster together on pine, cypress and eucalyptus trees. Their migration to the town is so unique that Pacific Grove is nicknamed "Butterfly Town, U.S.A."

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