OK, had to look up where I heard that from. The Lizard Keepers Handbook by Philipe de Vosjoli..in the chapter on feeding he states "Mice are nutritious, but when only one or two days old they are also calcium deficient for lizards (unless they are offered very soon after removal from the mother)." I imagine that if very young pinks are offered, like the ones given to young snakes, that they should be occasionally supplemented. Especially since young snakes are growing quite a bit and their calcium needs would be high. If you're using older, bigger pinks or fuzzies, I imagine it's not so much an issue. I know the info. is for lizards, but I imagine snakes really aren't all that different. Anyways, for my little ones on pinks, I supplement with calcium every third feeding and for my older, smaller garters on pinks, I go once a month.

Roy