 Triceratops has an extended cameo , being sick with an unidentified disease . Its appearance was a particular logistical nightmare for Stan Winston when Spielberg asked to shoot the animatronic of the sick creature earlier than expected . The model , operated by eight puppeteers in the Kaua 'i set , wound up being the first dinosaur filmed during production . Winston also created a baby Triceratops for Ariana Richards to ride on , a scene cut from the film for pacing reasons . Gary Rydstrom combined the sound of himself breathing into a cardboard tube with the cows near his workplace at Skywalker Ranch to create the Triceratops vocals . 
