Side note, the noises from elephants are often used by movie and game for sound effects. A good example I thought of was XCOM 2, where the Berserker' roar is a mix of an assortment of sounds, including an elephant.
Great finds, thanks! I found another DSWT film available when I looked up The Elephant Diaries on Amazon called A Keeper's Diary:
https://www.amazon.com/Keepers-Diary-African-Environmental-Foundation/dp/B001LNOKR4