Uglystunbastard
Baryonyx
The Baryonyx is a large crocodile-like predator. While it might lack in attack power, its ability to swim extremtly fast makes it a fierce opponent — especially with its ability to travel on both land and in water.

How ARK players tame and knock out the Baryonyx: what to feed it, what to knock it out with, and how to keep it safe.
If you rightclick underwater everything around you will get stun for 10s