Ospreys like other birds have a different digestive system then humans. Birds have no teeth which are usually a key component to digesting food. Instead of chewing their food Osprey's swallow fish whole. they may shred off pieces of the fish with their beaks to help to swallow. Since they can not brake up the food in their mouths they have to do it in they stomachs. The birds stomach is broken into two chambers. The bird swallows its food whole then it travels to the first chamber known as the Crop. In this chamber the swallowed food is introduced to chemicals used to brake down the food, much like saliva in humans. Once the food is coated in the chemicals it is moved to the second chamber called the Gizzard. Here the food is "chewed". The gizzard contains sand and grain like particulars that are used to help mash up the food.