This sucker is not passive. Me and my friend were running through the forest and this thing jumped out and killed me. When I came back to get my stuff, it lunged 20 feet and killed me again. After the third death I gave up on recovering my stuff. It was not tamed by an enemy tribe because it was me and a friend on a private server.
If you see it and are landing on a flying mount land somewhere else that are fast and can jump at you also a lot of times they are with other things like spiders and centipedes so look out for other things if your going to tame.