In this post from way back when I wrote about a slug and a snail that were enjoying a meal of dog poop. As far as the nutritional requirements of gastropods go, feces must rank right up there on the scale of wholesome nutrition.
And now here is a picture of a snail, Mesodon thyroidus, approaching some feces that may have been left by a raccoon.
The next picture shows the snail having its shit and eating it too!
These pictures are from last weekend's field trip.