tibiotarsus
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thumb|right|250px|Pigeon 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.
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thumb|right|250px|Pigeon 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. thumb|left|Tibiotarsi of Grus cubensis, [[Propelargus edwardsi, and Palaelodus gracilipes at the Museum für Naturkunde, Berlin]]
Excerpted from Wikipedia’s “tibiotarsus” article, available under the CC BY-SA 4.0 licence.