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I also found this Clouded Sulfur along the Canon City Riverwalk. Like so many of the butterflies I have seen, it was on rabbitbrush. With about a 2 inch wingspan, Clouded Sulfurs are large enough to be easily seen especially when compared to the many small yellow butterflies. A common species, it is found throughout Colorado and many other states.
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The proboscus, the (straight dark) tubular feeding tongue that extends from the butterfly mouth, can be seen by double-clicking on the lower pic. SeEtta
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