The building itself is shaped in the form of a giant tridactyl dinosaur footprint. MSM-303-2 is a right foot with a seemingly tridactyl form and robust phalanges. The foot is not well known but functionally tridactyl with hoof-shaped instead of sharp claws. Their feet were tridactyl and their legs shorter than in related groups. The middle three toes are well-developed, giving the foot a tridactyl appearance. The hand was tridactyl (three-fingered). The hands are long, and tridactyl, with a reduced third finger in "Caudipteryx" and "Ajancingenia". The manus is not tridactyl, and metacarpal V is present. The tracks are tridactyl (three-toed) and have large and coarse digits, with prominent claw impressions. Some birds, like the sanderling, have only the forward-facing toes; these are called tridactyl feet. As is typical of theropods, the feet were tridactyl (with three clawed weight-bearing toes).