From the intro to an interview with the writer of the documentary Zoo, premiering at Sundance:
>Based on interviews with members of the now-defunct Enumclaw horse
>sex community, who call themselves "zoos," the movie charts how the
>Internet brought this group together, and how the death of one of
>its members from a ruptured colon after having sex with a stallion
>broke this group apart. Far from a traditional documentary, the
>narration is taken from extensive audio interviews with members of
>the group and was edited together to form the spine of the story.
http://www.greencine.com/article?action=view&articleID=396&gcdispatch-168&att=zoo