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Disambig.png See also: Lamprey

These values may differ with what you see in-game or written elsewhere. But that is what the dossier says.
Haementeria laetus
Time Period
Steam.svg 242.0
June 2, 2016
Xbox One.svg 737.0
June 15, 2016
PS.svg 501.0
December 6, 2016
Logo Mobile.svg 1.0
May 24, 2018
Nintendo Switch.svg 599.0
November 30, 2018
Epic Games.svg 311.74
June 11, 2020
Spawn Command
admincheat summon Leech_Character_C
admincheat SpawnDino "Blueprint'/Game/PrimalEarth/Dinos/Leech/Leech_Character.Leech_Character'" 500 0 0 35
Variant Diseased Leech
admincheat summon Leech_character_Diseased_C
admincheat SpawnDino "Blueprint'/Game/PrimalEarth/Dinos/Leech/Leech_Character_Diseased.Leech_Character_Diseased'" 500 0 0 35
XP For Kill
4 XP
Feces Size

The Island Topographic Map.jpg
Spawning Leech The Island.svg

The Center Topographic Map.jpg
Spawning Leech The Center.svg

Ragnarok Ocean Topographic Map.jpg
Spawning Leech Ragnarok.svg

Valguero Topographic Map.jpg
Spawning Leech Valguero.svg

Genesis Part 1 Topographic Map.jpg
Spawning Leech Genesis Part 1.svg

Crystal Isles Topographic Map.jpg
Spawning Leech Crystal Isles.svg

Common             Rare
  Untameable   Cave

The Leech is one of the Creatures in ARK: Survival Evolved.

Basic Info[edit | edit source]

Dossier[edit | edit source]

This section is intended to be an exact copy of what the survivor Helena Walker, the author of the dossiers, has written. There may be some discrepancies between this text and the in-game creature.


It is difficult to be angry with Haementeria laetus, despite its rather terrible nature. The creature has practically no intelligence, and just attaches to any nearby living flesh in an attempt to drain that creature's blood.

Removing Haementeria requires precision bladework, or access to an open flame. Both of these can be nearly as dangerous to the host as to the leech itself.

Once Haementeria attaches to a host, it drains blood at a rapid pace, and the host experiences hunger, loss of health, and lowered stamina. Some Haementeria are also carriers for a dangerous disease I've dubbed "Swamp Fever," which persists beyond the leech's own lifespan. Few creatures on the Island are transmitters for this disease, and it can ultimately be cured with a rare medicine.


While Haementeria is not intelligent enough to be tamed, it is always useful to keep a few around for antidotes and fishing lures. When processed properly, Haementeria venom can be made into a powerful antivenom!

~ Helena

Behavior[edit | edit source]

Leeches lurk in the water, waiting for tames or survivors to pass by whereupon they leap gleefully and attach themselves to their victim.

Diseased Leech (Variant)[edit | edit source]

The Diseased Leech.png Diseased Leech is a variant of the Leech distinguished by its red and orange color scheme as well as its name in the HUD. It transmits Swamp Fever, which can be cured with Lesser Antidote. The carcass of the Diseased Leech can also be harvested for significantly more Leech Blood than its normal variant.

Appearance[edit | edit source]

One of the most revolting creatures that inhabits the island is Haementeria laetus, a leech that grows as long as a man's arm. A blood parasite, the soft-bodied creature actively seeks out hosts in the swamps it calls home, propelling itself with fluttering fins and latching on with a mouth full of sharp rasping teeth.

In the wild, leeches are the primary vector for a debilitating disease commonly known as swamp fever.

Color Scheme and Regions[edit | edit source]

The Leech always spawns with the same color scheme, but the Diseased Leech has different colors from the Leech.

X mark.svg

The Leech always spawns with the same color scheme and has no color regions.

This means it is currently impossible to make alterations to the Leech's colors.

Drops[edit | edit source]

* The Diseased Leech drops significantly more Leech Blood than its normal variant.

Base Stats and Growth[edit | edit source]

Note that creatures will have different stats in Survival of the Fittest

Attribute Base Value Level Increase
Health 40 +8
Stamina 100 +10
Oxygen N/A N/A
Food 450 +45
Weight 10 +0.2
Melee Damage 7 +0.35
Movement Speed 100% N/A
Torpidity 50 +3
Movement Base Speed Sprinting Speed
Walking 50 ?
Swimming 70 175
Attack Values
Melee Stamina Cost Attack Range Description
Base Minimum Activation The Leech bites the target until it can latch onto its host. While leeched, both the host's Health.png Health and Stamina.png Stamina will slowly drop. If it is a Diseased Leech, Swamp Fever.png Swamp Fever may be transmitted to a Human host.
0 150 0 200
Attack Type Damage Projectile Values Torpor Values Status Effect: Stamina Status Effect: Torpidity
Life Impulse Radius Base Mult Duration Damage Mult Amount Duration Damage Mult Amount
Melee 7

The Diseased Leech has the same values except of Health, which is 120.

Combat[edit | edit source]

This section describes how to fight against the Leech.

General[edit | edit source]

  • To get rid of a leech that is already hanging on your body you need fire, e.g. a Campfire or a Cooking Pot. Jump into the burning fire for a short time, the leech will then disappear. Dying and removing the leech off your corpse also works. Keep in mind, however, that sometimes the leech you see on your screen actually lives on your mount. Go back to your mount and remove it manually.
  • To remove a leech from a creature, press and hold the Use key (E by default) and select remove leech from the menu that appears.
  • There is a diseased variant of this creature (Diseased Leech). You can cure the disease by consuming Lesser Antidote.

Strategy[edit | edit source]

  • Bug Repellant will make you invisible to all leeches even if you touch them. If you attack them, however, they will still be aggressive.
  • Travel well-mounted; you need something tall enough to keep you out of the water and large enough that you stay standing on its back when dismounted. This way you can remove leeches from your mount without having to expose yourself to them.
  • If your mount needs an escort in the swamps, use a flock of flyers; ground-bound escorts are likely to be leeched without you noticing, and if you do notice, you will have to step entirely off your mount to remove them, potentially exposing yourself to other leeches.
  • Keep your eyes peeled; use your mount's attacks to 'plow the road' in front of you as you navigate the swamps in the hopes of killing leeches before they latch on.
  • If you see a leech from far enough away, attack it with ranged weapons to kill it before it has a chance to latch on; once they do, it will not be possible to harvest them even if you remove them.
  • At present, all mounts are immune to Swamp Fever; only humans and Dodos can catch it.
  • Leeches don't attack or attach themselves to tamed Beezlebufos and any other mounts native to the swamp, making them great for hunting Leeches.

Weaponry[edit | edit source]

  • The leech does not require any serious weapons to kill, although killing it before it reaches melee range is valuable; try to finish it with ranged weapons or, failing that, hold it at a distance with spear or pike.

Dangers[edit | edit source]

  • Make sure to bring a friend with you, or stay out of its attack range with a tall mount. If the leeches latch onto you, another player is the fastest way to remove it; if it's attached to your mount, you can remove it yourself.
  • When they attach onto you, you wont regenerate stamina, and you will lose health slowly. Make sure to use that remaining stamina to get to a safe place fast.
  • Leeches are often found in areas that contain other dangerous enemies. Beware they don't weaken you at a fatal moment.

Weakness[edit | edit source]

  • As it is harmless unless entering melee range, ranged weapons are ideal.

Taming[edit | edit source]

Leeches can be 'tamed' using Fish Basket Aberration Icon.png. However, as they lack the required intelligence, they will not return once they have latched onto someone or something.

Utility[edit | edit source]

Roles[edit | edit source]

Spotlight[edit | edit source]

Notes/Trivia[edit | edit source]

For information pertaining specifically to the real-world Leech, see the relevant Wikipedia article.

  • Dino Dossier was revealed on 02/08/16 on Steam.[1]
  • The Leech's genus, Haementeria, refers to a modern genus of leeches which includes the Amazon Giant Leech, which can grow up to 17 inches.
  • On The Center, Leeches are more commonly found in deep water that the player can submerge him or herself in.
  • When going into certain waters while raining a swarm of Leeches will come after you. Which will allow you to obtain large amounts of Meat, Chitin, Leechblood and Silica Pearls.
  • Despite Lesser Antidote being the go-to cure for Swamp Fever, there are a few other ways to cure it. Consuming Nameless Venom will cure you, but it will also take 50 health away. Transfering from any server to Scorched Earth will also cure you. One can also simply level up their character to be cured.
  • A maximum of 6 leeches can latch onto you and your dinos. The rest will bite you and your dinos to death.
  • Harvesting leeches with the Megatherium will get you hundreds of chitin.
  • Real Leeches lay eggs however Ark's Leeches do not.
  • When real Leeches give birth they put themselves and their eggs into cocoon.
  • Leech do not produce Feces
  • The Leech along with the Coelacanth, Piranha, Sabertooth Salmon, and Trilobite, all became tamable with the Fish Basket Aberration Icon.png introduced in Aberration.
  • Real leeches have multiple tiny eyespots to help them see.
  • Unlike most creatures, real leeches don't have gills or lungs, instead, they breathe by absorbing oxygen through their skin. They can breathe on land and in water.
  • Originally proposed by /u/Coloumbia in 2015 on Reddit.com/r/playark

Changelog[edit | edit source]

Patch Changes
242.0 Leech and Diseased Leech are added to the game
  • Made Swamp Fever particles not visible on the player anymore from their first person perspective
  • Made Fortitude levels more effective for avoiding dieases
243.3 Fixed Leeches and other swamp water creatures not spawning
  • Activated water swamp creature spawns that were not active
  • Fixed issue of getting multiple Swamp Fevers if you had leeches attached to you on each subsequent game relaunch
244.6 Diseases are now permanently cleared ever time you level up
246.3 Lesser Antidote can now be crafted with Deathworm Horns as an alternative to Leech Blood or Woolly Rhino Horn
252.1 Leech Blood can now be placed in the quick item slots, allowing to feed it to Moschops for taming
262.0 Added Leeches to the Swamp Cave on The Island
279.261 Fixed a bug which caused Pachyrhinosaurus pheromone gas to give Swamp Fever
279.275 Fixed a glitch when the player would die with a Leech attached and the Leech would be stuck to the player's screen after death
305.12 Fixed a bug where the Fish Basket wasn't returning creatures properly

Gallery[edit | edit source]

References[edit | edit source]