Occamy

The occamy, a bird-snake hybrid, is usually a placid creature, but can be dangerous when threatened. They are particularly defensive of their eggs which, having a solid silver shell, are prized targets for poachers. Occamy also possess a unique ability to change size, depending upon their environment. In open spaces, an adult can reach lengths of up to 15 feet, but can instantly shrink to fit into a space as small as a teapot.

The occamy patronus is said to appear to those who are pensive but also open to change. Those producing this patronus are also often ferociously loyal to friends and family.