Hyacinth, one of my Cuckoo Marans has always been very thin... she eats like a horse. She literally consumes as much as three chickens -- she is ALWAYS hungry. Today she has started to poo stones of all shape and colors -- these are stones from outside, not organic internally created stones. Should I take her to the vet or is this normal? She's laying beautiful eggs and seems otherwise very healthy (except for her runway thin figure -- she just doesn't put on weight regardless of the volume of food she eats.) Thanks for your input.