This is the greatest Yahoo! Answer on whether vampires can poop

A brief discussion of the human digestive system and then the probable vampire population given an exponential growth rate should explain why vampires are not possible. 4. Theoretical ingestion of blood to supply these nutrients would therefore have to occur at least once a day, and would require the ingestion of the entire blood supply which could not happen as the stomach is far too small to hold that much liquid volume.

via Tech News Headlines - Yahoo News http://ift.tt/1HQlzqU