This's a sound effect designed by Joel Valentine. It's also used by Hacienda Post. It can be heard on The Producer's Sound Effects Library as part of "MONSTERS ROAR #1"; a much lower-pitched version of the screeches can be heard as "MONSTER GROWL #1" on the same library. Links: https://soundeffects.fandom.com/wiki/Joel_Valentine_Monster_Screech_Sound#Audio_Samples