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Agricultural encroachment on the Sierra Campanario monarch butterfly overwintering reserve, in Michoacan, Mexico, 26 February 1999. This dramatic picture shows about 2 million monarch butterflies hovering as a golden mist above the Oyamel forest in late February, 1999, about three weeks before the monarchs depart on their spring remigration back into the United States. Photo: Lincoln P. Brower, Sweet Briar College.

Tagged monarch. Photo courtesy: Monarch Watch

Another tagged monarch. Photo courtesy: Monarch Watch

Monarch taggers. Kansas. Photo courtesy: Monarch Watch

More monarch taggers. Kansas. Photo courtesy Monarch Watch

Monarch egg. Photo courtesy Monarch Watch

Monarch caterpillar. Photo courtesy Monarch Watch

Monarch pupa. Photo courtesy Monarch Watch

Monarch emerging. Photo courtesy Monarch Watch

Monarch. Photo courtesy Monarch Watch