"Studies on decomposing mice suggest that the microbial content of a corpse can offer clues as to how old a body is and the approximate time that death occurred."
Read more: http://www.digitaljournal.com/article/359185#ixzz2gIJFVHRo
http://www.colorado.edu/news/releases/2013/09/24/new-cu-boulder-led-study-finds-%E2%80%98microbial-clock%E2%80%99-may-help-determine-time
Paper:
http://www.elifesciences.org/wp-content/uploads/2013/09/eLife.01104_INPRESS.pdf