Tim, I can only verify the behavior of species I have kept. It seems in my experience that female aggression is more common in some species than others. I've noticed it in bulls, carpet pythons, some boas (commons, "red tails", garden/amazon tree boas, and emeralds), White lip pythons, bloods, and green trees with a strong degree of consistency. However, some of those animals are known to be aggressive in general and most people who breed whether hobby or otherwise keep more females than males and this was certainly true in my case. My observation with all those species is males settle down faster and are more pleasant in demeanor. However, this perception could be skewed by the ratio difference of males to females kept and or interacted with. The exception to that would be bulls and carpets which I've interacted most closely with over the years as I have always enjoyed these species more than the others resulting in longer periods of interaction with these species.
I've noticed no real difference in others I've kept such as various corns, milks, kings, gophers, hog nose, ball pythons, bloods, rosy boas, dumerills boas, sand boas, childrens & spotted pythons, as well as a few odd species here and there. The reason for this could be less real interaction with the animals as many of these where maintained simply as breeding stock with interaction limited to husbandry purposes. It would be interesting to see what others here have found with regards to aggression level differences between sexes with species they have or currently keep.
