Having a hard time deciding whether to have bat guano or a Big Mac for lunch? Think no more, the results are in: bat guano has more protein, more minerals, but less fat and less calories than a McDonald's Big Mac.
From Fenolio et al., 2006. Eurycea spelaea is a cave salamander.
Your choice is clear.
Danté B. Fenolio, G.O. Graening, Bret A. Collier, Jim F. Stout, Coprophagy in a cave-adapted salamander; the importance of bat guano examined through nutritional and stable isotope analyses, Proceedings of the Royal Society B: Biological Sciences, Volume 273, Issue 1585, 22 Feb 2006, Pages 439 - 443.