This sound effect can be found on the Soundelux Sound Effects Library, which was made by SoundDogs. It includes Hollywoodedge, Elephant Baby Trumpe AT043501, Hollywoodedge, Elephant Single Shor AT043401 (in a slightly higher pitch), Hollywoodedge, Elephant Single Shor AT043402 and Hollywoodedge, Elephant Single Shor AT043403.