There's a particular one we named Ocean Man that's outside our herbivore island on me and my friends private server. It's been there since the update. It won't leave. We want to go on a boat ride on my cruiser but he just blocks us. But we don't kill him, cos he's funny. In fact one of my friends got salty and attacked the island in a raft. Ocean Man devoured him in seconds.
My raft was almost complete. It had a smithy, forge, mortar and pestle, my bed... everything! Just need a few more railings. Then out of nowhere an alpha one of these destroyed it all. Back to stone tools for me.
Ok. We're at herbivore island, great place to start. Good materials, safe, and has good oil veins close in the water. Said me, after building a raft and nearly losing it to the fish after getting killed by a baryonx at the start of the game.
After having a look around, you can imagine my face when I realised there were two more near herbivore island.
Once me and my friends were heading to our town on herbivore island, and then this thing comes. It's like out of Moby Dick. One of my friends shouted "ABANDON SHIP!" And jumped into the ocean, swimming to shore. Me and my two other friends stayed on the ship, with our rifles ready. Then my friend who abandoned us tried to help us by shooting the beast with a bazooka. He did manage to kill it, but he killed us and the raft too. We have since put handcuffs on him, and put him in our prison in the cave in carnivore island.