Are there any animals that have green feces?
Babies often have green poo or yellow poo as it passes through the system so quickly
Many herbivores with inefficient digestion also have green feces. Goose droppings in my office park are almost indistinguishable from wet grass clippings. Almost.
Cows - use to shovel the stuff at the dairy farm
Lagomorphs, a family of mammals including rabbits and pikas, leave green droppings after they eat fresh vegetation. They then re-eat the feces and re-digest them. After the second digestion, the feces will be brown as more nutriment is extracted.
Any animal can have green feces if it has an upset stomach or diarrhea.