| The tibia and fibula are fused, especially distally, to form a single element, the tibiotarsus. |
| The third muscle to consider is a superficial muscle that lies along the anterior side of the tibiotarsus. |
| The cnemial crest is a rather enormous proximal extension of the tibiotarsus and sticks out beyond the distal end of the femur. |
| The larger birds in Nova Scotia and the smaller ones in Utah differ by only 2 mm in average length of the tibiotarsus. |
| Increased robusticity of owl bones could be seen in the general shape of the tarsometatarsus and its articulation with the tibiotarsus and the phalanges. |
| The bird's tibia has been fused with some of the upper bones of the foot to form the tibiotarsus. |
