This sound effect can be found on Soundelux Sound Effects Library, which was made by SoundDogs. It includes Hollywoodedge, Dinosaur Growls 1 SS015701, Hollywoodedge, Dinosaur Growls 2 SS015702, Hollywoodedge, Dinosaur Growls 3 SS015703 and Hollywoodedge, Dinosaur Growls 4 SS015704. H-B ELEPHANT - BIG ELEPHANT ROAR, ANIMAL 03 and Sound Ideas, ELEPHANT - ANGRY ROARS, ANIMAL are also included. Links: https://soundideas.sourceaudio.com/track/43430816