<classify> 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.  <topic>: sciencetechnology 