I have chicks ranging in age from a few days old to two weeks and I conducted a grit experiment. I offered three sizes -- sand, granite bits that are small enough to go through a steel mesh colander, and larger granite bits that go through a plastic colander. The smallest chicks like the middle size and the bigger chicks take the largest pieces. Nobody is eating the sand. My conclusion is that given the option, chicks will choose surprisingly large grit for their size.

