monarch cluster

Photo By/Credit
Joanna Gilkeson/USFWS
Media Usage Rights/License
Public Domain
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."