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Tibiotarsus
Leg bone in birds / From Wikipedia, the free encyclopedia
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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Squelette_oiseau.svg/640px-Squelette_oiseau.svg.png)
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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Tibiotarsi_of_extinct_birds.jpg/640px-Tibiotarsi_of_extinct_birds.jpg)