Not even waste.
This Eastern Tiger Swallowtail butterfly was on the road at Rondeau Provincial Park, Ontario, Canada.
Not sure what type of scat, such a polite word for poop, it was but there were half a dozen butterflies on it at one point.
This unique species of swallowtail is a quick and strong flier, gliding when able. The males are a bright yellow, while the females can exhibit two different color forms; yellow and black and black and blue. The darker form is more common in the southern states.
source Garden with Wings.