Furcula
Irregular bone forming part of the appendicular skeleton
Also known as: Wishbone
Classification
Irregular bone forming part of the appendicular skeleton
Dimensions
Varies widely from less than an inch in tiny songbirds to several inches in large fowl like turkeys and geese, forming a characteristic V-shaped or U-shaped strut.
Key Features
Instantly recognizable by its symmetrical V-shape, slender arms, and a small bony bump or flat plate at the bottom meeting point where the two sides fuse together.
Similar Bones
May be confused with a pelvic fragment or a split rib, but the smooth, symmetrical V-shape and the distinct central joining point readily distinguish a true wishbone.
Across Species
Found exclusively in birds and some of their feathered dinosaur ancestors. In heavy running birds like ostriches, it can be reduced or absent, while in powerful flyers like falcons and gulls, it acts as a resilient spring to store and release energy during deep wingbeats.
Evolutionary History
Evolved from the fusion of the two collarbones shared by theropod dinosaurs, tracing deep evolutionary roots back through feathered dinosaurs and ultimately to early reptiles.
Photography Tips
Place the bone flat against a contrasting, non-reflective background with a small coin or ruler next to it for scale, using soft overhead lighting to highlight the delicate surface texture and the central joining point.