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A three-dimensional computer reconstruction (top) shows a theropod foot at three stages in creation of a deep track, moving right to left. A photograph of a deep Greenlandic footprint is shown below it. Image: Stephen Gatesy, Brown University Return to news release 98-123.

This three-dimensional computer image reconstructs theropod foot movements through sloppy mud. Penetration through the ground surface is shown in red. The first toe, which is not reversed as in modern birds, creates a rearward pointing furrow (a,b) as it plunges down and forward. The sole of the foot leaves an impression at the back of the track (c) because it is not lifted as the foot sinks. All toes converge below the surface and emerge together from the front of the track (d). Image: Stephen Gatesy, Brown University Return to news release 98-123.