I used to always use these for baby torts, but none of mine ever really showed much interest, so, some years ago, I just stopped putting them in there. When Cory came by the other day, I explained how I soak and feed Daisy everyday BEFORE putting in her in her outdoor pen as she has a tendency to eat little pebbles. She doesn't seem to do it if she's already full. He wisely suggested that I give her some cuttlebone to chew on as she might be trying to compensate for a mineral deficiency. I went and got some the next day and put them in both her indoor and outdoor pen. As I expected she just ignored them. She already gets regular calcium and vitamin supplements. Well, yesterday I heard the unmistakable crunching/scraping noise coming from her pen and when I looked in, sure enough, she was munching away. More of the same today. She's eaten quite a bit of it now, and I'm wondering if they can eat too much. She was munching on it instead of her greens today. She eventually ate her greens too, but she ate a lot of cuttlebone first.