Game Systems
Mutations explained
Mutations are passive abilities that change how your dinosaur survives, fights, or feeds. Every species has a pool of mutations it can roll — the right picks let a smaller animal punch above its weight; a bad roll can leave you with a useless slot. This is the full reference: every mutation in The Isle: Evrima with its value, restrictions, and (where applicable) how to unlock it.
How mutations work
Mutations slot into your dinosaur's active loadout and apply their effects passively for as long as they remain equipped. There are three broad categories:
- • Lifecycle mutations — the default pool available to (most) species.
- • Slot 2 exclusives — only roll on the second mutation slot.
- • Unlockable lifestyle mutations — gated by in-game tasks (e.g. kill 5 players at night, jump 50 times, drink saltwater until dehydrated). Once unlocked, they appear in your pool for the specified slot.
Tags below mark restrictions like Carnivore, Herbivore, Female Only, or Group Leader Only. Values are the listed in-game magnitudes for the effect.
Lifecycle mutations
Default pool — most species can roll these.
Accelerated Prey Drive
Carnivore10%Deal more damage to animals below 35% health.
Advanced Gestation
Female Only50%Faster egg gestation, incubation, and cooldown rate.
Barometric Sensitivity
HerbivoreReceive an indication prior to storms or droughts.
Cannibalistic
CarnivoreAvailable Slot 2 & 4For species that are not, by default, cannibals — adds their own species as a preferred prey for nutrients.
Cellular Regeneration
15%Recovers health slightly faster.
Congenital Hypoalgesia
15%Reduce incoming damage when fighting larger species.
Efficient Digestion
20%Your food drains more slowly.
Enlarged Meniscus
Fall damage hits stamina before draining health.
Epidermal Fibrosis
15%Increase bleed resistance.
Featherweight
50%Your footprints fade much faster.
Hematophagy
Carnivore15%Restore some thirst while eating corpses.
Hemomania
Carnivore5%Do extra damage on a bleeding target.
Hydrodynamic
15%Increased swimming speed.
Hydro-regenerative
25%Recover health faster during rainy weather.
Hypervigilance
Herbivore50%Increases camera angles when eating and drinking; increases footsteps audio from others.
Increased Inspiratory Capacity
15%Increased O₂ capacity.
Infrasound Communication
50%Make significantly less noise when talking in chat.
Nocturnal
5%Faster health / locked-health recovery at night.
Osteosclerosis
20%Resist or reduce fracture damage.
Photosynthetic Regeneration
Herbivore10%Regenerate stamina faster during the day.
Photosynthetic Tissue
5%Faster health / locked-health recovery during the day.
Reabsorption
1Recover a small amount of water during rainy weather or while swimming in drinkable water.
Sequential Hermaphroditism
Changes your sex. Mutation is not passed on to children.
Social Behavior
Herbivore / OmnivoreGroup Leader OnlyIncreased group size.
Submerged Optical Retention
5%Increased underwater vision range.
Sustained Hydration
20%Your water drains more slowly.
Truculency
Herbivore5%Bucking has a higher chance to dismount latched animals.
Wader
25%Less hindered when wading through shallow water.
Xerocole Adaptation
Herbivore15%Gain some water when eating plants.
Slot 2 — exclusive lifecycle mutations
Only available on the second mutation slot.
Tactile Endurance
HerbivoreConvert incoming damage to stamina.
Traumatic Thrombosis
Prevent death from blood loss if resting.
Gastronomic Regeneration
Eating restores a small amount of health.
Hypermetabolic Inanition
CarnivoreThe less hunger you have, the more damage you deal.
Unlockable lifestyle mutations
Gated by in-game tasks — once unlocked, they appear in your pool.
Augmented Tapetum
CarnivoreIncreased vision at night.
Enhanced Digestion
Decrease nutrition decay rate.
Heightened Ghrelin
Increased overeating capacity by a large amount.
Multichambered Lungs
Increases stamina regeneration threshold.
Osteophagic
CarnivoreAble to consume bones to regenerate fractures faster.
Parthenogenesis
Female OnlyLets you nest without a mate. Mutation is not passed on to children.
Prolific Reproduction
Female OnlyYour babies have increased health and stamina regen. They need less food and grow faster.
Reinforced Tendons
Jumping costs less stamina. Reduces takeoff stamina for Pteranodon.
Reniculate Kidneys
Can drink saltwater. Thirst pool: 1,000. Thirst intake value while drinking saltwater: −2.5%.
Horde test content
Experimental mutations from test branches; behavior may change.
Pit Organ
Can see sources of IR (infrared) light.
Paratrepsis
Able to fake fractures.
Cochlear Sensitivity
Indication of sound traps from a distance.
Removed content
Kept for historical reference — no longer available.
Intraspecific Aggression
Removed in 0.15.116Deal more damage to animals of your own species.
Related
For a different angle — beneficial vs harmful mutations, triggers, and a server-side management walkthrough — see the Jurassic Isle of Exo mutations guide.
Mutation values, restrictions, and availability change between patches — corrections welcome via the Discord linked in the footer.