Many birds regurgitate pellets. It is not only owls that produce these compact bundles of indigestible material. Other birds of prey, grebes, gulls, herons, cormorants, kingfishers, corvids, shrikes and even swallows and shorebirds spit out pellets. Pellets can comprise indigestible plant matter, insect skeletons, bones, fur, feathers and so on; anything that the bird finds hard to digest. Owl pellets are the most well known, as they are relatively large, well formed and compact, and often occur in accumulations at regular roosting spots. Such pellets can be ‘dissected’ to reveal what the owl had eaten. In general, larger owl pellets are made up of fur (or feathers), which in turn contains the bones, teeth etc of whatever the owl has eaten. The smaller pellets of Little Owls may also contain a high proportion of chitinous insect carapaces.