Get a dimorphodon with 3k HP and damage. Set the dimorphodon neutral. Get a shield. When the guy strikes, raise the shield and leave the dimorphodon finish the job. Don't let him to get you to water. Easy as pie.
This guy is my favourite so far, right from when I first meet him, I was a noob and wandered close to a swamp well he came flying at me missed and disappeared behind me, I'm like what the neck was that, climbed a big arse rock asap and looked around, bugger came bounding back towards me and leapt straight up that rock like it was a mole hill.
Tamed the bugger and took him hunting, came across my first raptor and shat myself thinking oh rap I am screwed, nope Kappa flys over my head, collects the raptor and pile drives it into the ground several meters away, hilarious. Always fun times with Kappa around.
For all the noobs out there, if these things kidnap you in the swamp, here’s what to do. Take out your bow/ gun. Pray you have ammo and fire right into its head. This strategy has saved me countless times.
P.S. If you have a strong melee weapon such as a pike or sword on you, that also works.