What a pretty butterfly! It’s a great spangled fritillary (Speyeria cybele).
What has it landed on? Let’s take a closer look.
Eewww! It’s a dog turd!
It’s not at all uncommon for butterflies to feed on feces–they get some good nutrients. Is that any worse than that expensive gourmet coffee that tastes so good because coffee beans are eaten by Asian palm civets and crapped out?