I highly recommend counting on being dragged off by one of these guys, stay away from the water even on a tall mount, the lower you go, the higher the chances of you being knocked off your mount and dragged off into the water. Have a sword or bolas, I usually go with the sword option as you can just go on to kill it immediately.
The higher your Melee the better your chances of killing them with little damage taken. I've fought them off easier with the sword.
Avoid Dinos that are low to the ground cause they will snatch right off... Just avoid the swamps until you have the appropriate equipment and armor to deal with Dinos in the swamp. These guys are worse than Sarcos.
Normally swamp rafting is a safe endeavor but after trying to transport 12 animals I lost 3 because they can aggro on dinos through wood as well as deal damage.
Also letting you know they can somehow clip into the interior of the raft of big enough and eat your dinos on the inside. I have a sunken foundation raft except for one foundation but stone is crucial for protection against moderate threats.
RIP to Mollon the Pteranodon and my beavers Char and Frost.
The children will grow up stronger fighting the Kapro