Monarch butterflies Monarch Buttecatching the sun on an oyamel tree in a Mexican overwintering site. (IMAGE)

University of Chicago Medical Center

Monarch butterflies Monarch Buttecatching the sun on an oyamel tree in a Mexican overwintering site.

Caption

Monarch butterflies are catching the sun on an oyamel tree in a Mexican overwintering site.

Credit

Jaap de Roode

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