Here is a side view of our new soon-to-be-sapient friend the hyenaboon.

Baboony features: Shape of the head, long kinked-up tail, knee joints significantly below the line of the abdomen, hands with opposable thumbs, the teeth, and the feet and hands are fully skin on the underside, not furry with indiviual pads. Also, the gait. Spotted hyenas seem to bring both feet on one side of the body forward at the same time. The baboons and geladas have the more common quadruped walking gait.

Plus we have the general hair pattern taken from the gelada monkeys - curvy bits coming off the side of the face (which I didn't have on the previous pic), long cape of hair covering the back and shoulders, and the big tuft on the end of the tail. The hyenaboons' noses probably stick out too far for them to do that terrifying lip-flip thing that male geladas do, thank goodness.

Hyena features: The colour. Yellowy-orangey with brown legs, face and tail tip, and brown spots. They may come in other colours in other habitats, like black ones or stripy ones. Plus: shape of the nose, the ears, the paw-like feet, especially the digitigrade hind feet, and the neck. Monkeys have approximately zero neck compared to hyenas. The colour of the eyes are also a dark brown, not the pale brown of baboons. There is also a dorsal crest of hair that stands up between the long hairs of the cape that flop over to each side. The length of the mouth round the sides of the muzzle is longer than in baboons.

The genitals of the males will probably resemble those of hyenas (of which I have found a really good new reference pic - behold! http://www.arkive.org/spotted-hyaen.....e-G27615.html) but I'm not going to wish that nasty birth-canal issue on the females, so they can have something in between, with a reasonable exit point for the babies. Not sure if they have brightly-coloured bums that swell up during oestrus, or if they have secret ovulations and whenever mating more like humans.