Tibiotarsus

{{Short description|Leg bone in birds}}

File:Squelette oiseau.svg skeleton; numbers 10 and 11 indicates the tibiotarsus]]

The tibiotarsus is the large bone between the femur and the tarsometatarsus in the leg of a bird. It is the fusion of the proximal part of the tarsus with the tibia.

A similar structure also occurred in the Mesozoic Heterodontosauridae. These small ornithischian dinosaurs were unrelated to birds and the similarity of their foot bones is best explained by convergent evolution.

File:Tibiotarsi of extinct birds.jpg, Propelargus edwardsi, and Palaelodus gracilipes at the Museum für Naturkunde, Berlin]]