Abstract: One hundred sixty-three footprints that pertain to Therangospodus have been found in the Tuchengzi Formation at the Luofenggou track site in Chicheng County, Hebei Province,China. Five swim tracks were subsequently made by the same track makers after water submerged the region. In addition to the Therangospodus tracks, one exceptionally large theropod track and one possible trail trace are referred to Megalosauripus isp. Theropod tracks of the grallatorid morphotype predominate at this site and at six other known Tuchengzi Formation track sites; grallatorid tracks at each of these sites are dominated by individual specimens in particular size ranges. If the tracks were made by the same species of track maker, the variation in dominant track size among sites suggests that cohabiting groups were composed mainly of members of a single age class, ethologically similar to some extant lizards and Alligator. If the tracks were instead made by different species, their size distribution (favoring smaller species) suggests that species of different sizes may have preferred discrete territories or specifically avoided close contact with other (particularly larger) species, ethologically similar to modern carnivorous mammals.