Butterflies are less efficient than bees at moving pollen between plants. Highly perched on their long thin legs, they do not pick up much pollen on their bodies and lack specialized structures for collecting it. However, they create a marvelous color combination of nature on this sunflower!
Beauties of Nature
Photos by Ravi 
Every time I go to where my combo planting of Zinnias and Sunflowers thrives I see plenty of butterflies and bees.
A beautiful combination, Joe!
It truly is.