It is my understanding that every time a new species evolves, it is started by the presence of a pregnant female of the new species. I guess a fertilized egg would do. Sam [log in to unmask] -----Original Message----- From: Andrew K. Rindsberg <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Friday, March 31, 2000 9:07 AM Subject: Re: [CONCH-L] Scavengers >Gijs, to an ichnologist, a chicken is a nest's way of making another nest. > >Andrew K. Rindsberg >Geological Survey of Alabama