I am working on the development of a humanoid species. I figured they'd have split along the evolutionary chain around the same time as humans. They'd live in a warm climate, resulting in little hair any where, but their head, since eyebrows and lashes protect against debris and head hair protects against the sun. I also gave them horns, a tail, claws, long canines, black scleras, and grey skin. They each have both sets of genitals, but the 'boy' part is sheathed, and their bodies adapt when they become pregnant. I think I have a decent backing to each evolutionary trait, but I want to know if it seems too unrealistic.

I thought I should explain some of my reasoning for the selected traits. The horns, teeth, and claws developed because the species is very aggressive. The sheathed genitals because they are notorious weak spots on a creature, and because the species is aggressive, I thought it'd make sense. The tail is because the species dwells in trees more than the floor and tails contribute to balance. The grey skin is more for camouflage against the tree bark. They became hermaphrodites due to a lack of females thousands of years ago and it is impossible to impregnate themselves.

(On another note, it isn't too weird that they'd lack clothing, since it's a warm climate, is it?)