I need a pictorial guide or an identification key for the identification of the broken body parts of insects and other food items found from droppings and regurgitated samples of Raptor birds.
Check this: Talmale, S. S., & Pradhan, M. S. (2009). Identification of some small mammal species through owl pellet analysis. Zoological Survey of India, Occasional paper no 294. (available on ZSI website)