What are Biomods in Subnautica 2?

Biomods are active and passive skills you unlock by scanning certain fauna. It's a new Subnautica 2 mechanic that turns the scanner into more than a databank filler — some creatures are worth seeking out specifically for the Biomod they grant.

Which Subnautica 2 creatures are dangerous?

Creatures are color-coded by threat: Passive (green) flee or ignore you, Wary (yellow) react if provoked, Aggressive (pink) will attack — like the Marrowbreach, Foureye and Needler Mango — and Leviathan (red) are the giants. The Hammerhead is a notable exception: a herbivore, but territorial, and it rams.

Subnautica 2 Creatures — Every Fauna by Threat Tier & Biomods (2026)

Q: How many creatures are in Subnautica 2?

Around 30+ fauna are documented in the May 2026 Early Access build, with more added every update. Source counts vary (some report 51 creature archetypes, others 88 total flora and fauna) because the roster isn't settled yet — Unknown Worlds is adding creatures across the two-to-three-year Early Access window.

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The Threat Tiers

Every creature is colour-coded by how it reacts to you. Read the colour before you swim closer.

Passive (green): flees or ignores you. Free scans — these are where most Biomods come from.
Wary (yellow): won't start a fight but will defend itself if you crowd or provoke it.
Aggressive (pink): actively hunts or attacks on sight. Scan from range or from cover.
Leviathan (red): the giants. Avoid, don't fight — full leviathan guide here.

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Passive & Wary — Safe(ish) to Scan

These won't hunt you. Herbivores like the Geordie, Hoverthorn, Surge Jelly and Water Slug flee or ignore you outright — the one to respect is the Hammerhead, a herbivore that's territorial and rams.

Creature	Notes
Geordie / Electric Geordie	Herbivore — flees or ignores you.
Hoverthorn / Black Hoverthorn	Passive grazer (Observatory / Root Canyon).
Surge Jelly, Hycean, Jelly Ring	Drifting passive jellies across several biomes.
Water Slug, Flash Slug	Small, harmless, easy scans.
Coral Crab, Periscopic Clowncrab	Passive shallow-water fauna.
Bluemoon, Halfmoon, Harvestmoon, Waxmoon	The "moon" fish family — passive, Shallows.
Pneuma	Passive fauna (deeper biomes).
Hammerhead territorial	Armored herd herbivore — won't hunt you, but rams if you enter its space.

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Aggressive — These Bite Back

Pink-tier hunters. Scan from cover or distance, and don't linger once you have the entry.

Creature	Notes
Marrowbreach	Apex-tier predator — one of the nastiest non-leviathans.
Foureye	Carnivore hunter.
Needler Mango / Nibbler Mango	Carnivore / omnivore — the Needler Nest (Observatory) is their home.
Epicurean	Carnivore.
Houndgar, Bullethead	Aggressive mid-size hunters.
Twin Sitaray, Tongue Thief, Sandspear	Aggressive fauna — attack when close.

Early Access note: some creatures don't have full databank entries yet, and a few names/behaviours will change as the game updates. Treat the flagged entries as provisional.

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Leviathans — the Red Tier

The giants get their own guide. Five are confirmed in Early Access — the Collector and Shiver (hostile), the Great Jaw and Deepwing Brooder (docile), and the titan-class World Tree.

→ Full Subnautica 2 Leviathans guide — locations, hostile vs docile, and how to scan each one.

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Biomods — Why Scanning Matters Now

The big new wrinkle: scanning certain fauna unlocks Biomods — active and passive skills that help you explore and survive.

In the first Subnautica, scanning mostly filled the databank and unlocked blueprints. In Subnautica 2, some creatures are worth tracking down specifically for the Biomod they grant, which makes the passive (green) tier more than a checklist — it's where a lot of your progression hides. Scan everything that won't eat you.

Subnautica 2 Creatures FAQ

How many creatures are in Subnautica 2?

Around 30+ fauna are documented in the May 2026 build, with more each update. Source counts vary (51 archetypes / 88 total flora & fauna) because the roster isn't settled — it's Early Access.

What are Biomods?

Active and passive skills you unlock by scanning fauna — a new Subnautica 2 system. Some creatures are worth hunting down just for the Biomod.

Which creatures are dangerous?

Anything pink (Aggressive) — Marrowbreach, Foureye, Needler Mango — and red (Leviathan). The Hammerhead is a herbivore but territorial, so it'll still ram you.

Are the Reaper and Ghost in Subnautica 2?

No — new planet, all-new roster. See the leviathans guide for the new giants.

Subnautica 2 Creatures — Every Fauna by Threat Tier