This sound effect can be found on Soundelux Sound Effects Library, which was made by SoundDogs. It is an extended and slightly higher pitched version of Sound Ideas, Gorilla Roars and Breaths 01 (with the first roar in its normal pitch) and 02, which also features a part not available on Sony Pictures Sound Effects Library Volumes 1-5. All of this is played on the left channel, with two higher pitched snippets of Sound Ideas, ELEPHANT - VARIOUS SNORTS, GROWLS, TRUMPETS, ANIMAL played on the right channel. Links: https://soundideas.sourceaudio.com/track/43380594 https://soundeffects.fandom.com/wiki/SoundDogs,_Animals-Monkeys,_Gorillas_-_Gorilla_Silverback_Congo_Silverback_Dat_01_02#Audio_Samples