This sound effect can be found on the SFX Kit, which was made by Sound Ideas. It includes an excerpt of Sound Ideas, BEAR - LARGE BLACK BEAR: SNARL AND ROAR, ANIMAL 03 in a low pitch.
Links:
https://sounddogs.com/Search?RecordingType=Sound%20Effects%20and%20Music&NavSearch=True&keywords=10233595
https://soundeffects.fandom.com/wiki/Sound_Ideas,_MONSTERS_%26_CREATURES_%5C_BEASTS_-_EXTRA_LARGE_MONSTER:_GIANT_APE:_HURT_ROAR#Audio_Samples
