I think eastern populations are the easiest to get started on mice and the western populations are the hardest. My Loma Alta babies come out of the egg eating ft pinks and my Xmas babies are the hardest to get started. My Comstock and Langtry babies are fairly easy and my Sanderson are a little harder. My Juno babies were easy.
If you look at the wild animals from those areas, they are also bigger from east to west. Brewster and Presidio Co. Animals being the smallest, you would think maybe they eat more lizards in the wild.