<P> At the time of death , a condition called `` primary flaccidity '' occurs . Following this , the muscles stiffen in rigor mortis . All muscles in the body are affected . Starting between two and six hours following death , rigor mortis begins with the eyelids , neck , and jaw . The sequence may be due to different lactic acid levels among different muscles , which is directly related to the difference in glycogen levels and different types of muscle fibers . </P>
how long does it take for rigor mortis to set in in animals
Starting between two and six hours following death