It still turns whitish as it ages. I have a pile near a plant I've been watching and photographing. Can't help but see the pile to avoid getting it in the picture.
If it's black and smallish in size - it's probably a wild animal. They utilize all of the goodies in whatever they catch.
If you want poop - go to a store where they sell cheap stocking fillers around Christmas. There's pooping moose, reindeer, penguins, you name it and they all dispense some kind of chocolate colored candy.
Sent by UFO