This sound effect can be found on The General Series 6000 Sound Effects Library, which was made by Sound Ideas. An identical copy of this sound effect, BIRD, CROW - CROW CALLING, is also available on The Mix I Broadcast Music Library. A similar sound effect, BIRD, CARRION CROW - CARRION CROW, CORVUS CORONE, BIRD, DIGIFFECTS, is on Rural Sound Effects by Digiffects - Series C. Links: https://soundeffects.fandom.com/wiki/Sound_Ideas,_BIRD,_CROW_-_COMMON_CROW:_CALLS,_ANIMAL#Audio_Samples