A PAL.1588, respectively a left and a right tibiotarsus. Last is a bulbous medial condyle of the tibiotarsus (lower leg bone). The medial condyle of tibiotarsus distal end has a prominent distal extension. It is fused with the upper ankle bones into a tibiotarsus. By 1925, Miller had assigned three more tarsometatarsi and an incomplete tibiotarsus to the genus. The tibiotarsus is comparatively long and the tarsometatarsus short. It resembles the lanner falcon but is darker overall, and has blackish "trousers" (tibiotarsus feathers). The tibiotarsus was about 30% longer than the femur. The tibiotarsus is more robust with a flared lower extremity. The tibiotarsus of the assigned specimen is essentially identical in size to the holotype. The tibiotarsus is extremely large in comparison to "Aepyornis" and "Mullerornis". The tibiotarsus was found fragmented into three parts consisting of the shaft and distal end. The proximal tarsals are never fused in a separate astragalocalcaneum; a tibiotarsus is formed.