Actually yes, I do. I save the jaws off of deer I kill, along with the ones that I find in the woods. (I have an uncanny knack for finding skulls in the woods[&:]). I take them home, clean and whiten them, drill a hole in them,then I have an old chain from a fan that I made into a loop where I hang them. I started this just a few years ago, but I have jaws from 6 months, up through 3.5 years. I take a permanent marker and write the age on the side for future reference. Now any deer I kill I can compare and see how old it was.