It also indicates that the furcula of birds is derived from clavicles. The clavicles do not fuse into a furcula. A widely arched furcula is present with slender and posteriorly curved clavicular rami. Bucky is the first "Tyrannosaurus" to be found that preserved a furcula (wishbone). The scapula, coracoid and furcula are all preserved on the main slab. One species, "Coelophysis bauri" has the oldest known furcula (wishbone) of any dinosaur. The furcula (wishbone) is V-shaped and indicates a high and narrow trunk. "Limusaurus" also had a furcula, or wishbone, which previously was unknown among ceratosaurians. The wishbone (furcula), an element not known from any other ornithomimosaurs, was U-shaped. Most species have an abdominal, tail-like appendage known as a furcula. A rare element present is the furcula and the stapes of the ear. The holotype preserves a furcula and a basket of fifteen pairs of gastralia. Sub-surface-dwellers, are usually unpigmented, have elongated bodies, and reduced furcula. Tinamous have a proper semicircular furcula, with no trace of a hypocleidium. The presence of a furcula was reported.