What spawns in the Old Growth Birch Forest biome (Overworld)? 14 mobs with spawn weights, chances and group sizes for Java & Bedrock.
| Mob | Weight | Chance | Group size |
|---|---|---|---|
 Creeper |
100 | 19.4% | 4 |
 Skeleton |
100 | 19.4% | 4 |
 Slime |
100 | 19.4% | 4 |
 Spider |
100 | 19.4% | 4 |
 Zombie |
95 | 18.4% | 4 |
 Enderman |
10 | 1.9% | 1–4 |
 Witch |
5 | 1% | 1 |
 Zombie Villager |
5 | 1% | 1 |
| Total weight 515 · 100% | |||
| Mob | Weight | Chance | Group size |
|---|---|---|---|
 Sheep |
12 | 30% | 4 |
 Chicken |
10 | 25% | 4 |
 Pig |
10 | 25% | 4 |
 Cow |
8 | 20% | 4 |
| Total weight 40 · 100% | |||
| Mob | Weight | Chance | Group size |
|---|---|---|---|
 Bat |
10 | 100% | 8 |
| Total weight 10 · 100% | |||
| Mob | Weight | Chance | Group size |
|---|---|---|---|
 Glow Squid |
10 | 100% | 4–6 |
| Total weight 10 · 100% | |||
| Mob | Weight | Chance | Group size |
|---|---|---|---|
| Creeper |
100 | 20.2% | 1 |
| Slime |
100 | 20.2% | 1 |
| Spider |
100 | 20.2% | 1 |
| Zombie |
95 | 19.2% | 2–4 |
| Skeleton |
80 | 16.2% | 1–2 |
| Enderman |
10 | 2% | 1–2 |
| Witch |
5 | 1% | 1 |
| Zombie Villager |
5 | 1% | 2–4 |
| Total weight 495 · 100% | |||
| Mob | Weight | Chance | Group size |
|---|---|---|---|
| Sheep |
12 | 24% | 2–3 |
| Chicken |
10 | 20% | 2–4 |
| Glow Squid |
10 | 20% | 2–4 |
| Pig |
10 | 20% | 1–3 |
| Cow |
8 | 16% | 2–3 |
| Total weight 50 · 100% | |||
| Mob | Weight | Chance | Group size |
|---|---|---|---|
| Bat |
10 | 100% | 8 |
| Total weight 10 · 100% | |||
Weight = spawn weight of the mob in its category · Chance = weight ÷ total weight of the category · Group size = how many spawn together.
In Java Edition 14 mob types can spawn in Old Growth Birch Forest — hostile mobs: Creeper, Skeleton, Slime, Spider, Zombie and Enderman and 2 more; passive mobs: Sheep, Chicken, Pig and Cow; ambient mobs: Bat; underground water mobs: Glow Squid.
Creeper, Skeleton, Slime and Spider share the highest spawn weight among the hostile mobs: 100 of 515 (19.4% each) in Java Edition.
Yes. Java Edition lists 14 spawn entries for Old Growth Birch Forest, Bedrock Edition 14. For example, Skeleton has a weight of 100/515 (19.4%) in Java and 80/495 (16.2%) in Bedrock. Use the edition switch above the tables to compare.
Each spawn attempt first picks a category (for example hostile or passive mobs), then one mob of that category at random, weighted by its spawn weight. A mob's chance is its weight divided by the total weight of its category in the biome — so the shares in each table add up to 100%.
Read the Old Growth Birch Forest article in our Minecraft wiki
