There are no vitamins or nutrients in rabbit feces, but there are many nutrients in their cecotropes, and when rabbits eat their cecotropes, it does look like they're eating their feces. See the related question below for more details.
The correct wording is why do freshwater fish eat feces. The answer is that they do not absorb nutrients well so they have to digest the food, now feces, twice. Zaragotha (Zara)
Either because they can or because they are missing certain nutrients.
Some moths eat feces because they are able to glean nutrients it. They can also eat decomposing plant and animal matter.
The nutrients in the feces (poop) helps the African plants.
feces
Cyclospora is found in foods that are contaminated with feces.
It depends if they have nutrients in them, most likely the same thing will just come out again.
Fertilizer can be a composition of man made and natural nutrients combined to replenish the soil nutrient deficiency. Where manure is natural nutrients from animal feces.
No, feces is composed of wastes from digested and partially digested foods after the body has tried to gather all the nutrients it can from the food-stuffs. In addition, feces contains the bacteria E Coli and fluid.
Pig feces is called pig manure. Pig manure is used as a fertilizer for grass in Ireland as it is a great source of nutrients for plants.
fragment of feces of a fly