The furcula (the technical term for a wishbone) is formed by the fusion of two collarbones at the sternum. The furcula is an important part of a bird's flight mechanics — a connecting point for muscles and a strengthening brace for wings. The bone is elastic and acts as a spring that stores and releases energy during flapping. (Ever try to snap a wishbone before it's dried?)
Scientists once thought the furcula was unique to birds. Paleontologists now tell us that the bone dates back to two-legged, meat-eating dinosaurs including the Tyrannosaurus and Velociraptor. These reptilian movie stars didn't fly. Their furcula likely served as structural supports as the dinos held their prey.
This cast measures 15" along the curve