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City University of New York		 Lab #6, Assignment #3Page 1
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Now we need to consider how dinosaurs and their potential analogs position their legs when standing. It is not hard to come to an understanding about this, because when one surveys this aspect of posture among modern vertebrates, the observation that there are only two alternatives is readily seen. The question then becomes whether our dinosaurs also used one of these two alternatives, and if so, which one.

The two types of posture seen in modern tetrapod vertebrates are diagrammed below.

What we need to do is find a way to determine which of the two postures was actually used by bipedal dinosaurs. And we need to do it using evidence contained in trackways.