Once you passify the monkey, DO NOT stray too far away from it. It will start attacking again and you cannot tame it. Make sure to have the kibble or meat beforehand.
Dinopithecus
The Dinopithecus is a tamable and ridiable giant baboon in the Lost Island free DLC. After ARK ran a community voting contest, this creature was the top voted of the ten semi-finalists with 6,214 votes (and 35% of the total vote).

Player-written tips for taming, using, and fighting the Dinopithecus in ARK: Survival Ascended & Evolved.
You can carry the alpha far from his/her pack and drop them into a taking pen then bring them below 50% to tame
add the dinopithecus king plz dododex
They are replacing are thyla noooo
You only have to kill two of them, not the whole pack. Once two are killed, it will tell you the health has to be under 85%. I was able to attack it with flak and a primitive sword. It eats anything. I used raw meat in my last hotbar slot.
I am so confused, why does it say that they only spawn on lost island when I have seen them running around on valgeru???
I think using a maewing to steal the wild infants is a valid taming method
Big monkey better know as Rafiki
Has an immunity to fall damage
Has a charge jump(no animation but definitely there and scales with how long you hold the button as usual)
Greater climbing ability than the thyla(even if if a little bit choppy and unrealistic-ish)
Name idea:Tarzan
They can be tame with meat but idk if its more efficient
Trap it in stone or higher and kill all but the alpha the best food is exceptional kibble
Need to fix this it eats meat to tame not berries
You can only tame the alpha of a pack. You have to kill so many of its pack and then lower the alpha’s health below 80% in order to tame it. I think it’s a cool mechanic
We just tamed one, passive tame with cooked meat
It’s crap will make tek stop working and you can put grenades into it and it will put them in its turd and throw them so you can use them to siege other bases
From what I've heard and read these fun little beasties are aggressive but to get rid of the troops also known as the pack you just have to kill or knock out the alpha
I hope it can have color mutation in its butt i didn’t say this it’s syntac
Oh god it’s another giant danger monkey
When I killed it’s pack members I used a fire wyvern then got it below 85 percent
They have an EXTREMELY RARE spawn chance on Val ( Valguero ), in the redwoods. Ark Wiki shows aswell.