How does a tortoise know to eat it? Like does it sense it is lacking that in it's diet so it takings a nibble. Is it like a pica thing. I recently got a cuttlebone for Rolo and he uses it. I hear him taking a bite. Then just walks away. I would get those for my parrot and never once did he munch it. So now do I not need to provide other calicum supplements? I would dust his food but he stopped eating it dusted. So on a whim I got a cuttlebone. Can they over do it and eat too much?