They were probably used in supporting the anterior portion of the body when the creature was feeding, and in aiding it to recover an upright position.

The specimen represented as feeding is posed so that the fore legs carry very little of the weight of the body.

There are four toes on the front foot but the thumb is greatly reduced and the fifth digit or little finger, is absent." (Subsequent discoveries have shown that the arrangement of the digits made by Marsh and followed in this skeleton is incorrect.

It is the first digit that is absent, and the fifth is reduced.) "The hind legs are massive and have three well developed toes ending in broad hoofs.

The pelvis is lightly constructed with bones elongated like those of birds.