 Ngenxa yokuthi izimpaphe zama-dinosaur aziso isiqu esikhule kahle, osibizwa ngokuthi i-rachis, kodwa zinezinye izici zezimpaphe  izindlendla kanye nama-barbule  abacwaningi baphethe ngokuthi i-rachis cishe bekungukwakheka kokuziphendukela kunalezinye izici. 