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640 pixels wide: (d4225-1.jpg)

A monarch butterfly sits on top of a red zinnia flower

 Image Number d4225-1

A monarch caterpillar feeds on common milkweed, Asclepias syriaca. Milkweed plants, primarily from the genus Asclepias, are the only food source of monarch caterpillars.

 

Photo by Peggy Greb.

 

 

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