Hello! I just rummaged around the whole site but colud not find the name of this particular sound effect anywhere. It can be heard in Dinosaur (2000) for Carnotaurs, in Shrek (2001) for the Dragon and in Battle at Big Rock (2019) for the Allosaurus. I suppose it's an elephant roar.

If anyone knows what is it, please solve this mystery! I hope I'll get the answer here.