What is the purpose of a casting for a hawk?

The purpose of a casting for a hawk is to remove undigested materials from the stomach. When a hawk consumes its prey, it digests the nutritional parts and needs to expel the indigestible components, such as bones, fur, and feathers. This process results in the formation of a pellet known as a casting, which the hawk regurgitates. By casting, hawks help maintain their digestive health and prevent build-up of undigested materials. This is a natural behavior that also provides insights into their diet and feeding habits, making it an important aspect of falconry management and the care of these birds.