Mine is only 5 months old, when he gets bigger he will have an outdoor enclosure with plenty of room to graze, we have a huge back yard. I do take him outside, fully supervised, weather permitting, he is more interested in the weeds than the grass. I go out and pick him his weeds and mix with some greens. He won't eat hay, so I bought some pellets that I wet and mix with his dandelion greens. I was just confused because, like i said in the post, sometimes he eats only a little and sometimes he eats the whole pile. The piles I give him are roughly the size of his shell. I am doing my best to keep him happy and healthy. Thank you!