Dododex
ARK: Survival Evolved & Ascended Companion
These guys are absolutely great for water, if you your playing a map with lots a water (even only waist high) then these guys are faster than any other tame, hit harder than most, are tankier than most and are too absurdly easy to tame, breed, and store. They can breath underwater, and on land so they can literally be anywhere and there attack distance is surprisingly far. Bonus if your still reading, these guys are great in groups but make sure there not directly following you if you have more than 2, they will cround you and get you stuck in the mob. Make them follow and dino that is following you. Also if you want to see a sarco fly then take a group of them (the more the better) and fly out into the ocean then up about 30 ft or so and watch them try to dogpile up to you.
