This sound effect can be found on Just Birds & Animals I Sound Effects Library, which was made by Sound Ideas. It is the same sound effect as Sound Ideas, ANIMAL, ELEPHANT - MANY ELEPHANTS IN A HERD. Despite being labelled as an elephant sound, it was actually recorded from lions. Two excerpts can be found on Animal Sound Effects Library as Discovery Sound, DINOSAUR - Dinosaur-4 and as Discovery Sound, COW - Cow-2. Links: https://soundeffects.fandom.com/wiki/Sound_Ideas,_ELEPHANT_-_ELEPHANT_HERD:_SMALL_INDOOR_GROUP_ROARING,_ANIMAL#Audio_Samples