Call me crazy, extremist, or whatever. I order quantities of F/T rats that are basically around 10% of my snakes body weight. When I get them in I weigh each one and put it in a ziplock bag with the weight wrote on the bag and put them in a freezer with the biggest to the bottom and smallest to the top. My snake starts with the smallest and eats her way to the largest. I only have the one snake right now, so it's not much work. I track everything more than needed, but it's just fun to me to be able to see how she is progressing. I do plan to breed her and plan to purchase more snakes, so I'm sure this will change with more animals to tend to!