There are examples of both plantigrade and digitigrade
The link between digitigrade
posture and cursoriality often occurs in other vertebrates, such as mammals and even birds (Alexander, 1984).
Clark and his coworkers observed that the joint between the toes and foot could not have flexed enough to make possible the digitigrade
movement, or toe-walking, seen in birds and some dinosaurs.
All species are digitigrade
with nonretractile claws, although the granulated pad or calcaneum extends the full length of the carpus and tarsus to the ankle and heel, which sometimes contact the ground when the animal is moving slowly.
Given the short blunt digits measuring a maximum of 4.7 mm in length, the tracks may represent deep, digitigrade
underprints of a tetrapod trackway.