This sound effect can be found on the Sony Pictures Sound Effects Library Volumes 1-5, which was made by Sound Ideas. It includes a high pitched variant of ELEPHANT - ANGRY ROARS, ANIMAL from the Hanna-Barbera Lost Treasures Sound Effects Library and a low pitched version of Hollywoodedge, Leopard Snarl Fast CU AT012201 from Animal Trax. A mostly slightly higher pitched version is included as part of SoundDogs, Animals-Monkeys, Gorillas - Gorilla Silverback Congo Silverback Dat 01 02 on the left channel. Links: https://www.hooksounds.com/sound-effects/gorilla-roars-and-breaths-01/1620505/ https://soundeffects.fandom.com/wiki/Sound_Ideas,_Gorilla_Roars_and_Breaths_01_-_Series_of_gorilla_snarls,_breaths_and_roars#Audio_Samples