Comparison of footprint lengths of the Limiavipedidae, theropod traces, and traces of Mesozoic, Cenozoic, and extant birds.

Comparison of footprint lengths (mm) of Wupus agilis to Limiavipes curriei (Limiavipedidae), and to Cretaceous theropod traces Irenichnites gracilis (small), Columbosauripus ungulates and Magnoavipes (M. lowei, M. caneeri, M. denaliensis) (medium), Irenesauripus mcclearni (large), and traces of large Mesozoic, Cenozoic, and extant avians. If using size alone as a diagnostic criterion to distinguish small theropod traces from those of large avians, Wupus agilis, Limiavipes curriei, and Irenichnites isp. fall within a similar size class of track-maker as that of Ardea and Gruipeda isp.
Comparison of footprint lengths of the Limiavipedidae, theropod traces, and traces of Mesozoic, Cenozoic, and extant birds.