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Skeletal Remains of various, mostly extinct species can be found in the game. The majority of these skeletons are found in the Lost River, aside from Reaper Leviathan skeletons which are found in the Inactive Lava Zone.

Some skeletons can be scanned, doing so will provide additional story information, or other information.

Skeletal Remains Found in Alien Habitat

Disease Research Facility Skeleton

Disease Research Facility Skeleton - 1000 years old

This large creature was kept in the large aquarium of the Disease Research Facility for a long period of time for testing purposes. The skeleton is very odd in appearance, having a solid exterior shell, as well as an interior skeleton. The PDA notes shared skeletal traits with the Biter. It also states that this creature was a carnivorous life form.

The skeletal remains of a vast predator, discovered inside an artificial habitat at the alien research facility.

1. Habitat:
The environment constructed to house the specimen suggests it was kept alive in containment for research purposes for months, or even years. Organic matter indicates the habitat once supported extensive plant life, though it has since decayed.

2. Cause of Death:
Time of death coincides with the facility's abandonment. There is little physical damage to the skeleton, suggesting death from malnourishment or outside interference.

3. Biology:
While it shares some skeletal traits with the biter, this fossilized specimen is significantly larger, and features unusual forearms. It matches no living species encountered so far, indicating it has either faced extinction in the past thousand years, or evolved beyond recognition.

Ancient Skeleton

Ancient Skeleton

Ancient Skeleton - 7000 years old

This huge skeleton is found outside the Lost River Laboratory and is surrounded by spotlights and cables. This species is presumed extinct. The skeleton is the only one known to exist and is approximately seven thousand years old. It appears to be some sort of huge carnivorous life form. The skeleton is composed of many bone plates. Running parallel on down either side of the skeleton are twelve large holes, the purpose of which is unknown. It has six eye sockets and many sharp teeth, each tooth being larger than the Player.

This skeleton is large enough that the player can swim through the gaps left by its missing teeth.

Projections suggest this lifeform would have been far larger than any living specimen encountered on the planet so far. The remains date to seven thousand years ago.

Reaper Skeleton

Reaper Leviathan Skeleton

Reaper Leviathan Skeleton

Reaper Leviathan remains can be found on the floor of the Inactive Lava Zone. They are either found as whole skeletons, or just skulls. The Reapers came to be in the Inactive Lava Zone due to Sea Dragon Leviathans making infrequent trips to the surface to hunt them, and then bring them back down to eat.

This skeleton matches the internal bone structure of the reaper leviathan.

- 0 reaper specimens encountered in this biome
- Burns and other damage to the skeletal structure fits the attack profile of the sea dragon leviathan
- It is possible the sea dragon's main food sources in this biome became depleted, forcing them to hunt more dangerous prey nearer to the surface

Leviathan Skeletal Remains

Sea Dragon Leviathan Skeleton

Sea Dragon Leviathan Skeleton - 1000 years old

This skeleton is found in the Lost River Junction. It belonged to a Sea Dragon Leviathan that attacked the Disease Research Facility in an attempt to retrieve it's egg that the Precursors had taken as a method to hatch the Sea Emperor Leviathan Eggs. The Sea Dragon's attack on the facility destroyed it, but also caused fatal head trauma to the Sea Dragon; it died not long after the attack. The remains are approximately one thousand years old.

A semi-intact skeletal structure belonging to an unidentified leviathan.

1. Head Trauma:
There is clear evidence of physical trauma to the head. The damage is so severe it must have been received shortly before death, somewhere nearby, likely caused by high speed collision with a solid object.

2. Age:
The skeleton has been well-preserved, but calcium decay suggests an approximate time of death around one thousand years ago. Bone growth suggests the creature itself was in the egg-laying stage of its lifecycle.

Gargantuan Skeleton

Gargantuan Skull

Ancient Super Predator - 10,000,000 years old

This skeleton is enormous and ancient, approximately ten million years old, found in the Bone Fields. The skeleton belonged to an enormous super-predator, dwarfing both the Sea Dragon Leviathan and Sea Emperor Leviathan. The remains consist of a huge, reptillian-esque skull and sixteen pairs of huge ribs. The skeleton is covered in flora and coral. The skull is so large that a Cyclops can fit inside its jaws. The Precursors were also studying these remains, as evidenced by small, angular indentations on the ribcage, as well as the Disease Research Facility being partially set up to study it.  A smaller variant of this creature's skull can be found in the Ghost Forest.

The fossilized remains of a super predator.

- Aged to approximately ten million years old
- Its sheer size would have prohibited it from entering such an enclosed space, suggesting the geography of the planet has shifted around it over time
- The remains now support a vibrant microcosm of life

NOTE: There are a series of precise, angular indentations on the rib cage, suggesting a third party has taken samples from the specimen at a previous time.