This takes conclusions drawn in the article as givens, when those conclusions may not be supportable. I'm neither a phlebotomist nor a geologist, but is it rea

This takes conclusions drawn in the article as givens, when those conclusions may not be supportable. I'm neither a phlebotomist nor a geologist, but is it really impossible that an animal's blood would soak into the loose, sandy soil pictured in the article and disappear? Or that scavenger animals such as ants would eat or carry off dried blood?