The Reefback is a large passive leviathan with an ecosystem on it's back, (Juveniles have no ecosystems on their backs though.) it can be found in many different biomes, such as the Bulb zone, the Crag field, the Dunes, the Grassy plateaus, the Mushroom forest, the Sparse reef, and finally, the Underwater islands. Here i'll be covering the herbivorous leviathans. Partially safe, avoid going in front of it. It is approximately 20 x 20 x 20 meters in size (20m cubed), making it (technically) the smallest leviathan in the game.

It has 3000 health and both it's attacks (The kick and the stomp) will deal 40 damage to the player. It is Cathemeral meaning it is active both during the day and at night.

The poo can be picked up by the player and used as biofuel. It will occasionally poo (No i am not joking). The Sea Treader will walk in a predesignated path alongside others of it's species, it is unknown why they do this. It is Herbivorous but it is unknown what they feed on, perhaps plankton.

It has 2 large antennae, possible for sensing nearby creatures as it may have poor eyesight. It can be found in the Grand Reef, and Sea Treader's Path, materials such as shale and other things may spawn behind it as it walks. The Sea Treader leviathan is the only defensive leviathan in the game, meaning that it will only attack if you do a certain thing, in the Sea Treader's case, it will attack you if you get in front of it. In this section, we'll be talking about the Sea Treader, as it is the only 'land'-dweller (it's more of an underwater land dweller, it walks on the sea floor) leviathan in the game.

Subnautica reaper leviathan sounds