Great way to cut through the fat and make a point, Donut. It is true, the Natural/unnatural argument was about whether homosexuality was "natural," but somewhere along the way go flipped on its ear to become a discussion of how completely "natural" behaviors are eschewed by the "higher minded" human species.
On that note, I'd like to comment to John D., Morainne (what a way to escape a debate
), and Yorick. Yes, humans are dominant. No, they are by and large not responsible. And, while they have developed differently than other animals, there is no reasonable argument they are "better," "more advanced," "superior," or "more evolved." In fact, they may be inherently lesser, as humans are capable of deliberate evil, whereas all other species are basically instinctual and, ergo, innocent. I certainly think Dolphins are socially, and perhaps intellectually, superior.
Tho opposable thumb and oversized brains are great tools, but we have turned them by and large toward more evil ends than good ends. Maybe we have used them to make some great advances for the species, but we have also used them to subjigate a large percentage of the species. And, all the while we have been decimating other species.
Anyway, I know this may bother a lot of (most of) you folks, but I just wanted to point out that I take exception to all of the "superiority" talk when it comes to humans. I think we are at best slightly inferior and, at worse, not worth anything much at all.