Let me explain:
Birds of prey, such as owls, hawks, and eagles, do not have the ability to digest bones, fur, and feathers. Instead, they regurgitate these indigestible materials in the form of pellets. Pellets are typically cylindrical in shape and can vary in size depending on the species of bird. By examining pellets, scientists can learn about the diet of birds of prey and the prey species that are available in their environment.