Passive tame; Sneak up on one and have taming food in you bar. It'll take you on a wild ride on it's back, run into all other creatures and aggro them if you're unlucky.
I recommend to tranq them, then build a wall around it. That way, when it wakes up, it can't run around like crazy. You'll need to feed it tame food whenever it asks for it while you're on it's back, or you'll fall off eventually.
A great travelling companion on many of the Ark maps. The Equus has a unique taming method, where you must walk up to it, feed it(their preferred food is Rockarrots), and ride it. The horse will attempt to buck you off, but when it does, press the prompted button and you will stay on and increase its taming percentage. You cannot control the horse while you are riding a wild one, so be sure to clear out the area you decide to tame it in.
This stinking thing!!! So annoying!!! I was taming it on a cliff and I was a bit slow and it knocked me off. RIGHT INTO A SWAMP. I swear, while everything was eating me, sarcophagus, titanoboa and mega parana, I saw it laughing at me.