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Re: Lack of Running Giant Theropod Tracks

It can logically be assumed that small theropods ran, and in fact there examples of running tracks preserved.

Relative to a given body-style, as size increases, the frequency and relative speed of running generally decreases.

Huh, et al., in Cretaceous Research Volume 27, Issue 1, February 2006, Pages 123-138, present evidence that "small" (<2m hip height) individuals were "trotting" and "large" (2.6m maximum hip height) individuals were "walking" (according to the abstract). [I note in that the abstract, they do not make any specific claims relative to size scaling.]

All this begs the question, as Holtz implies -- why would a giant theropod species need to run?

That said -- maximum gait data from (e.g.) roadrunners, wild turkeys and ostriches could generate a curve that correlates stride frequency and length with size, and be combined with the data from Huh, et al., to provide yet another basis to 'guess-timate' the gait of the giant theropods.