A robber fly pollinates an aster (sp. Symphyotrichum) along Soda Butte Creek
A fly with yellow hairs on it is pollinating a purple aster flower.
NPS photo by Neal Herbert
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NPS/Neal Herbert
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Yellowstone National Park, Code: YELL
Yellowstone National Park Latitude: 44.581298828125, Longitude: -110.490097045898