Since I'm mostly interested in the animal, I like both. It depends on my mood if I like to watch same or mixed species animal on animal, human on animal or animal on human. Most of the time I watch male human on female animal or interspecies animal porn. But every combination is possible and I watch it from time to time. The thing I have nearly no interest in whatsoever, is human on human porn. It's mostly just boring and in many combinations ugly and gross. Exceptions prove the rule.