Baboons. Yes, we call our brothers baboons, but after reading this I'll have to find something else to call him. They are more gross than your brother can be (ok, maybe not everyone's brother).
There are 5 species of baboons that are only found in Africa or the Arabia. The average life for one in the wild is 30 years. They are the largest of the monkey family with the males reaching over 80 pounds and 40 inches long which does not include the tail which can come in various lengths. One misconception is that their tails are ones that can grip trees. This is not the case and most baboons prefer to stay on the ground than run around in the trees. They do venture up into the trees for protection from their only predators: leopards, cheetahs, and man.
They are hunted mainly as pest animals since they destroy the crops of local farmers. Though many are hunted for their meat. This is not a dish I'm dying to try. A group of baboons is known as a troop and they are named appropriately since they attack in a troop. They can converge onto the fields and do much damage in a short time which is one reason they are hunted by locals.
They also eat meat and some of the most famous videos are of them attacking animals some that are a little larger than themselves. The few people that I've known that have seen these creatures in the wild do not think highly of them since their eating habits are so vicious and the can be promiscuous with about anything they can get ahold of including raping smaller animals.
Personally, after reading more on them I've decided that they are not my favorite of animals. And looking at some of the pictures, they sometimes have bad days, too.
Next time you are the zoo, stop by and see what these baboons look like in real life up close. And try not to throw your brother in with them.