Allosaurus

Studies of Allosaurus hindlimbs indicate that juveniles had a longer leg length than sub-adults or adults. This fact would indicate that locomotion was also different.

As a young animal Allosaurus may have had more multi-directional loads and stresses on the hindlimb which is associated with agile running, not in a straight forward direction only as is indicated in adults. This ability to change direction quickly meant that the feeding strategy of a juvenile was far different than an adult. As a juvenile, Allosaurus may have been able to pursue small vertebrate prey but switched to being a more ambush-type predator as it grew larger.