Good spreadsheet, just little complicated for me. I have a BOOK for year's cohort, containing SHEETS per each snake. Because I don't weigh food, snakes (or measure them) and I don't records poops (if you have more than one snake in an enclosure - how do you know which one pooped?), the SHEETs are less complex. My system is not better than any other, just an alternative that suits me.