The video shows Zola having pure fun with an enrichment opportunity during Spotlight on Gorillas and is not a trained behavior; the music was added afterward.  Zola, nine-years old, is one of eight Western lowland gorillas currently living at the Calgary Zoo as part of the Association of Zoos and Aquariums Gorilla Species Survival Plan. He loves to play in water and keepers regularly give him the opportunity to do so as part of the enrichment activities they plan and vary on a daily basis.