I LOVE the Tatzelwurm. He is a very fun land mount, however he does have his drawbacks. Like running full blast and you stop short because a rock... which if you are running from something really sucks. Could he naturally climb over rocks like the Arthroplura... or maybe have a right click option like the Megalania? It slows them down, but allows them to climb... or a jump climb like the Thylacoleo? Actually I hadn't tested that last option, but I have a feeling it may not be there? The last option seems like it would be a bit glitchy (as it is for the Thyla)