My little quail hen has been laying for a month, and I noticed she was eating some white stuff she found on the patio floor (indoors "free range").
That stuff seems to be eggshells and drywall (cal/gypsum). The younger one (not laying) doesn't seems interested in them at all.
Thinking in lack...
I have a young cockerel (3 months old), a RIR chick (1w/o) and two quails (1w/o?). They are doing great so far, so I feel confident and went to buy a little baby quail. He/she was probably just some days old (it's entire body was the size of a little thumb). It was so lively in the trip home...