They can be found in the colder regions of the map and usually in groups. They are passive tames but if you get to close the group will attack. Best method is to pick them up with a Quetzal and drop them in a windowed taming pen. Similar to the Ape just feed them as they pass the window. Beer from the barrel or stimberries work.
For beginners these things will spot you in a split of a second so don’t even think of going up to it with a stimberry in your hot bar. Instead, get a ghille suit and sneak behind it and feed it a beer! Don’t use stimberries it is pain And time consuming unless you have a bush of stimberries. They eat berries after they are tamed though. Not beer.