About the size of a housecat, Compsognathus was a bird-like dinosaur that walked on two long, thin legs; it had three-toed feet. A long tail acted as a counterbalance and for stability during fast turns. It had short arms with two clawed fingers on each hand. Compsognathus had a small, pointed head with small, sharp teeth, hollow bones, and a long, flexible neck. Here in this example drawn by Bryan Baugh you can see just how thin and wirery the Compsognathus was. Hopefully from this and the other examples you can start to recognize some of the common anatomical shapes that appear over and over again in Theropods.