From RimWorld Wiki
Jump to navigation Jump to search



A large beaver-like creature genetically engineered to harvest wood with machine-like efficiency. In the absence of specialized feed, these animals will enter a manic state that compels them to eat trees whole, and are likely to attack if disturbed.

Base Stats

Market Value
250 Silver

Pawn Stats

Combat Power
Move Speed
3.7 c/s
Health Scale
Body Size
Mass - Baby
5.4 kg
Mass - Juvenile
13.5 kg
Mass - Adult
27 kg
Carrying Capacity
34 kg
Filth Rate
Hunger Rate
4.8 Nutrition/Day
Life Expectancy
12 years
Manhunter Chance
Manhunter Chance (Taming)
Trainable Intelligence
Minimum Handling Skill
Mate Interval
12 hours
Maturity Age
0.333 years (20 days)
Juvenile Age
0.1 years (6 days)
Comfortable Temp Range
-40 °C – 40 °C (-40 °F – 104 °F)


Meat Yield
63 alphabeaver meat
Leather Yield
24 lightleather
Gestation Period
8.5 days
Offspring Per Birth
1-3 (2 avg)

Melee Combat

Attack 1
Front left paw
7.2 dmg (Scratch)
11 % AP
2 second cooldown
Attack 2
Front right paw
7.2 dmg (Scratch)
11 % AP
2 second cooldown
Attack 3
8.5 dmg (Bite)
13 % AP
2 second cooldown
0.7 chance factor
Attack 4
3 dmg (Blunt)
4 % AP
2 second cooldown
0.2 chance factor
Average DPS

Instead of silently spawning as other animals do, Alphabeavers appear in a group only when the Alphabeavers event triggers. The event will only trigger in arid shrubland and tundra.


Wild alphabeavers can only appear in the Alphabeavers event, which itself only appears in the arid shrubland and tundra. This event requires that the temperature be above the alphabeaver's minimum comfortable temperature of -40 °C (-40 °F). The amount of beavers scales with a colony's raid points.

In addition, alphabeavers can appear in manhunter packs or in any biome in the possession of traders. They will still eat any trees they can come across. They can also appear in hospitality quests.


Alphabeavers are dendrovores. As they hunger rapidly, alphabeavers will need to eat trees constantly. They will consume any trees that they can reach, including anima treesContent added by the Royalty DLC, gauranlen treesContent added by the Ideology DLC, and polux treesContent added by the Biotech DLC. Alphabeavers will not and cannot eat the Wood wood item, wooden buildings, or any other item made out of wood.

They will not attack any player structure unless they go manhunter. The entire herd of alphabeavers can get angry if one is attacked. It is also possible for them to be driven mad by a psychic wave or psychic drone.


If wood isn't required by a colony, then alphabeavers pose little or no threat. Any trees that you are growing can be protected by enclosing them in walls. It may be worthwhile to cover the anima and guaranlen trees with walls, despite the penalties for doing so. As the anima tree gives the −6 Anima tree scream moodlet when destroyed, even colonies not reliant on one should protect it. ​Note that trees will automatically be cut down if a roof area is assigned to it, so use a remove roof area zone to prevent this.

Alphabeavers are not a particularly common animal for traders to have, but trader alphabeavers have no special regard towards any of the "super" trees you may be relying on. The best protection is to create temporary walls around any important trees.

There's no purpose to taming or buying an alphabeaver, beyond its novelty. While they can eat vegetable food and prepared meals, alphabeavers still have an enormous hunger rate. Their leather, lightleather, is also yielded by many other animals that don't hunger as quickly.

However, as they are assigned to an allowed area, not a pen, they can be used to eliminate trees outside colony walls without effort, thus reducing opportunities for attackers to take cover. Nevertheless, they have to be moved inside in the event of a raid, as enemies will try to kill them.


This animal can be trained as follows:

Guard:  Ex.png
Attack:  Ex.png
Rescue:  Ex.png
Haul:  Ex.png

*As of version 1.1.2610, all animals can be tamed. The percentage of likelihood of success depends on factors such as the Animals Wildness Percentage, Pawn Handling Skill, and others. More information can be found on the animals page.

Contrary to their description, Alphabeavers can't be trained (at least yet) to harvest trees around the map for wood. They will simply devour any trees available without leaving any wood behind.


Body part Health
Head 21
Skull 21
Brain 7
Nose 7
Neck 21
Jaw 7
Eye [1]
(left, right)
(left, right)
Body 28
(left, right)
(left, right)
Liver[2] 14
Heart[2] 14
Spine[2] 14
Stomach[2] 18
(left, right, rear, front)
Tail 7
  1. Located inside of Head.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Located inside of Body.


Version history[edit]

  • 0.8.657 - Added
  • Beta 19/1.0 - Alphabeavers incident now only occurs in biomes with sparse plants (arid shrubland and tundra), body size 0.6 -> 0.45
  • 1.3.3066 - Alphabeaver event will only happen even if the outdoor temperature is above their minimum comfortable temperature.