My little scientist dissected an owl pellett and absolutely loved it!!!
Here is the pellett before she started
These are all the bones she found in it.
Owls, like many other birds, eat their food whole. Since birds do not have teeth, they can't chew their food. Therefore, they use their strong and sharp beaks to rip their prey apart and then swallow large chunks whole. The owl slowly digests its meal by separating the softer materials (such as meat) from the harder material (such as bones). It then regurgitates the harder material along with indigestible items such as feathers and fur in the form of a pellet. http://www.kidwings.com/owlpellets/