>I might venture furthur to surmise that animals which eat sand (except
>little boys and girls) do so because they evolved in a place with a
>substance in the sand (in our case, calcium) that they needed.
I am not sure this is true. I would think that lizards would get a lot of
calcium from the herbivorous insects that they eat. Many dark leafy green
plants contain calcium. Many keepers are not good about gut loading their
insects with greens, and I also don't think we have formulated a good diet
that duplicates what insects would eat in nature. Maybe a lizard eats sand
as a last resort to get the calcium that we are not providing.
Catriona
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