 Dilophosaurus was also very different from its real @-@ life counterpart , made significantly smaller to make sure audiences did not confuse it with the raptors . Its neck frill and its ability to spit venom are fictitious . Its vocal sounds were made by combining a swan , a hawk , a howler monkey , and a rattlesnake . The animatronic model , nicknamed " <unk> " by Stan Winston 's team , was animated by the puppeteers sitting on a trench in the set floor , and used a paintball mechanism to spit the mixture of methacyl and K @-@ Y Jelly that served as venom . 
