Eggs

Eggs are in-development items found in Subnautica. They are the unhatched forms of certain types of Fauna. Until they hatch, the egg will be labeled as an unknown creature egg, changing to match the name of the creature the egg contains once it hatches. An egg can be identified by where it was found, its appearance, and its size (see table below).

Almost all Eggs can be placed inside an Alien Containment. After placing an egg inside an Alien Containment, it will stay where it was placed. After one to three in-game days, the egg will hatch into a smaller version of its respective species. The hatched creature will slowly grow, until it is mildly full sized or can fit to the confines of the Alien Containment. They can die inside of the aquarium however, if the aquarium's population limit is surpassed, or if they are left unattended for too long.

Baby creatures can be picked up and placed outside in the water, where they will instantly become fully grown. An aggressive creature will not attack the player if it is hatched in the aquarium, allowing the player to scan it even after it is released in the wild.

Eggs are also capable of being destroyed before they hatch. Hits with a knife will slice open the egg, resulting in no creature being spawned.

Eggs can be found in their species' respective Biomes, however, due to the game's physics in the game engine, an egg can roll into another biome or cave, an example of this is finding a Stalker egg in the Jelly Shroom Caves.

Eggs can also be used as fuel for the Bioreactor, though they provide far less energy than a hatched creature.

More information and animations can be found on Trello.

Normal Eggs

Egg	Size	Description	Location	Incubation Period (Day/s)	Item ID
Ampeel egg	4 (2x2)	Ampeels hatch from these.	Blood Kelp Zone Bulb Zone	1	shockeregg
Boneshark egg	4 (2x2)	Bonesharks hatch from these.	Bulb Zone Mushroom Forest Underwater Islands	1	bonesharkegg
Crabsnake egg	4 (2x2)	Crabsnakes hatch from these.	Jelly Shroom Caves, inside Jellyshroom	1	crabsnakeegg
Crabsquid egg	4 (2x2)	Crabsquid hatch from these.	Deep Grand Reef	1	crabsquidegg
Crashfish egg	1	Crashfish hatch from these.	Safe Shallows Safe Shallows Caves Kelp Forest Caves	1	crashegg
Cute Fish egg	4 (2x2)	Cute Fish hatch from these.	-		cutefishegg
Gasopod egg	4 (2x2)	Gasopods hatch from these.	Safe Shallows	1	gasopodegg
Jellyray egg	4 (2x2)	Jellyrays hatch from these.	Mushroom Forest Mushroom Forest Caves Deep Grand Reef	1	jellyrayegg
Lava Lizard egg	4 (2x2)	Lava Lizards hatch from these.	Lava Castle	1	lavalizardegg
Mesmer egg	1	Mesmers hatch from these.	-	1	mesmeregg
Rabbit Ray egg	1	Rabbit Rays hatch from these.	Safe Shallows	1	rabbitrayegg
Reefback egg	9 (3x3)	Incredibly, Reefbacks hatch from these.	-	3	reefbackegg
Sand Shark egg	4 (2x2)	Sand sharks hatch from these.	Grassy Plateaus	1	sandsharkegg
Shuttlebug egg	1	Shuttlebugs hatch from these.	-	1	jumperegg
Spadefish egg	1	Spadefish hatch from these.	Breeding in Alien Containment	1	spadefishegg
Stalker egg	4 (2x2)	Stalkers hatch from these.	Kelp Forest	1	stalkeregg

Spoiler alert: This section will reveal story-related material if expanded.
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Unique Eggs

Egg	Details	Location	Debug Spawn
Sea Dragon Leviathan egg	An egg found in a specimen case within the Disease Research Facility, this egg was taken by the Precursors one thousand years ago to help research ways to make the Sea Emperor Leviathan eggs hatch. This egg cannot be hatched.	Disease Research Facility	-
Sea Emperor Leviathan Egg	Five of the eggs laid by the captive Sea Emperor Leviathan in the Sea Emperor's Aquarium. These eggs must be hatched in the story.	Primary Containment Facility	-

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Gallery

<tabber> Normal Eggs=

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  Ampeel egg

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  Boneshark egg

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  Crabsnake egg

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  Crabsquid egg

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  Cutefish egg

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  Gasopod egg

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  Jellyray egg

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  Lava Lizard egg

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  Mesmer egg

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  Rabbit Ray egg

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  Sand Shark egg

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  Shuttlebug egg

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  Spadefish or Reefback egg

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  Stalker egg

|-| Unique Eggs=

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  Sea Dragon Leviathan egg seen on Sketchfab

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  Sea Emperor Leviathan egg

|-| Other=

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  Creature Eggs from Trello, day time

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  Creature Eggs from Trello, night time

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  Concept Art

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  An early model of the Sea Emperor Leviathan egg seen on Sketchfab.

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  A list of creature eggs, taken from the official Subnautica Twitter feed.

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  More eggs

</tabber>