Gathering efficiency is the invisible stat that decides how fast your base grows. Two players at the same node with different mounts collect wildly different amounts, and the difference compounds every trip. This page answers it two ways: which creature to tame for each resource, and what each of those creatures actually costs you in health, damage and carry weight.
Two mechanics, not one
ARK’s gathering is governed by two different numbers, and most guides blur them together. The attack decides what a creature can physically harvest — a tail swing on a rock, a claw on a bush. The weight reduction decides how much of that resource it can carry without being encumbered. A creature with no reduction for a resource still harvests it perfectly; it just fills up faster and needs a second trip.
The core table
| Resource | Best gatherer | Weight reduction | Notes |
|---|---|---|---|
| Metal | Ankylosaurus | 85% | The mountain-run standard, and the only dino that reduces metal |
| Stone | Doedicurus | 75% | Ankylo can harvest stone too, but at 250 weight it fills up faster |
| Wood | Mammoth / Castoroides | 75% / 50% | The beaver is cheaper to keep, the mammoth is the volume answer |
| Thatch | Castoroides | 50% | Shares the beaver’s other three reductions |
| Fiber | Castoroides | 50% | Moschops can harvest it but has no reduction |
| Chitin | Megatherium | None | The insect specialist — it harvests chitin, it does not reduce it |
| Berries | Any herbivore | None | Use a high-weight one; there is no reduction for berries |
| Crystal | Magmasaur | None | Late-game implant setup; nothing reduces crystal |
| Obsidian / Flint | Ankylosaurus | None for these | Harvested with the same tail swing as metal |
The Ankylosaurus earns its spot as the default first serious tame on a single number: 85% metal weight reduction, the only creature in the game with that on metal. It is what lets one Ankylo carry a full metal run without a second trip.
The stats behind the picks
These are the base values from the creature infoboxes. Damage is the number that matters most for harvesting speed, and weight is the stat that decides whether the harvest is worth the trip.
| Creature | Health | Melee damage | Weight | Temperament | Weight reduction |
|---|---|---|---|---|---|
| Ankylosaurus | 700 | 50 | 250 | Docile | Metal 85% |
| Doedicurus | 850 | 32 | 250 | Docile | Stone 75% |
| Mammoth | 1020 | 48 | 500 | Docile | Wood 75% |
| Castoroides | 450 | 28 | 300 | Friendly | Fiber, stone, thatch, wood — 50% each |
| Therizinosaurus | 870 | 52 | 365 | Territorial | None |
| Megatherium | 740 | 32 | 725 | Neutral | None |
| Gacha | 750 | 32 | 550 | Docile | Metal, stone, wood, fungal wood — 50% each |
| Moschops | 375 | 32 | 200 | Cowardly | None |
Two things fall out of that table. The Ankylosaurus’s 50 melee damage is more than double what most early creatures manage, which is why it clears a metal node so much faster than a Trike — harvesting speed scales with melee damage, not with a separate harvest stat. And the Therizinosaurus has the highest melee damage in the group at 52, which is what makes it the fastest plant harvester even though it carries no reduction at all.
Why the reduction matters more than it looks
Weight reduction applies to everything in the inventory, not per hit. An Ankylo carrying 85% less metal holds roughly six times the metal of a 250-weight creature at full capacity, and it does not drop speed doing it.
That gap is the whole early game. A player with an Ankylo stocks metal in one mountain run; a player without one is still walking back and forth when the sun sets.
The second tier: specialists
| Dino | Specialty | When it matters |
|---|---|---|
| Magmasaur | Crystal and metal | Late game, after implant setup |
| Therizinosaurus | Fiber, silk, plant seeds, cactus sap | Mid game onward, and it fights |
| Brontosaurus | Berries and thatch by weight | When volume beats speed |
| Giganotosaurus | Meat and general clearing | Not a gatherer — a war mount |
The pattern: reduction dinos for the resources you farm in volume, weight mounts for the resources you farm in bulk. Most bases end up with one Ankylo, one Castoroides, one Mammoth, and a Moschops wandering near the bushes.
Stone: Doedicurus
Worth calling out separately because stone is the resource that quietly runs out. You need it for structures, for refining metal, and for everything defensive. The Doedicurus has 850 health and 250 weight — more health than the Ankylosaurus at the same carry capacity — and it is docile, so it lives in a pen without turning on your other tames.
Alternative: Ankylosaurus, which covers stone and metal together at the cost of some raw stone speed.
Berries and fiber: Therizinosaurus
870 health, 52 melee damage, 365 weight. Territorial.
The best all-round plant harvester in the group, and the highest melee damage of any creature on this list. Its claws harvest fiber, rare flowers, silk, plant species X and Y seeds, wood, fungal wood and cactus sap, and the 52 damage makes every one of those jobs fast.
Territorial means it needs space and attention. It is worth both, because a single Therizino replaces three or four single-resource gatherers in your barn.
Alternative: Megatherium, at 740 health, 32 damage and 725 weight. It is an omnivore with a wide plant diet, a heavy build, and it is the creature to have when you need chitin as well as berries.
Chitin and insects: Megatherium
740 health, 32 melee damage, 725 weight. Neutral, omnivore.
The Megatherium is the insect answer. Its attack handles the arthropods that drop chitin, and its wide diet means it is cheap to keep fed while it does it.
It is heavy, at 725 weight, and that is a feature rather than a cost when you are loading it with the results.
The one that breaks the rules: Gacha
750 health, 32 melee damage, 550 weight. Docile, omnivore.
The Gacha does not harvest in the normal sense. It consumes one thing and produces another, which makes it a resource converter rather than a harvester.
That is a genuine late-game convenience and a genuine late-game expense, because keeping one fed is a project. Tame one when your base is stable, not before.
The weight question
Harvesters are only useful if they can carry what they collect, and weight is the stat that decides it.
The Mammoth at 500 weight and the Megatherium at 725 are the heavy haulers of this list. The Ankylosaurus and Doedicurus at 250 are the mid-range option. The Castoroides at 300 sits between.
A fast harvester with a low weight stat is a creature you watch fill up and then walk back with. That is why the Mammoth and Megatherium stay relevant long after their damage numbers look modest.
What to tame in what order
Early: Parasaurus or Trike for berries while you get established.
Mid: Ankylosaurus for metal and stone, then a Castoroides for wood.
Late: Mammoth for serious wood, Therizinosaurus for everything plant, Megatherium for chitin, and a Gacha once the base can feed one.
The passive setup
Two dinos collect while you do everything else:
- Moschops on wander — set it near bushes and it fills with fiber. Its wiki entry calls out that it can harvest a wide variety of resources and specialise into specific ones, so it covers more than fiber if you redirect it. Empty it when you craft.
- A weight herbivore parked on berries — keeps your crop plots fed without a trip.
Build these two and gathering stops being a chore list. Without them, every crafting session starts with a harvesting detour.