Owls are reclusive nocturnal raptors that generally swallow their prey whole.  The indigestible components of their food, such as bones and fur, are regurgitated in the form of compressed pellets that can be studied to reveal clues about the owls' diet.  Participants will investigate sterilised pellets from the North American Barn Owl to classify and identify bones, and to compare and sort the skeletons of the prey.  This very popular activity will build students’ observation and notation skills, and lead into discussions about diet, predation and avian forensics.  Extension activities include studies of food webs, digestion and skeletal form and function.  There is also the possibility to contribute results to an on-line database.