Every biome in Steal an Egg has a fixed list of pets, and each pet has its own spawn chance. Those numbers decide which biome is worth your time when you want a Secret, Eternal or Divine pet. The Steal an Egg wiki publishes them on its Drop Rates page, which says the percentages were found in the game files under ReplicatedStorage/Data/Areas.
This guide turns that page into something you can plan around: the rarest pet in every biome, the combined odds of hitting a Secret or better, the odds curve that newer biomes share, and the 45/45/10 roll that decides the 12th biome. Pet rarities and incomes come from our pet database.
How to read the numbers
- Inside a biome the chances add up to 100%, so each one is the share of that biome's egg spawns. A pet at 1% is about 1 in 100 spawns. Dividing 100 by the percentage gives the "1 in N" figures below.
- The wiki does not say how many eggs spawn at a time. Eggs reset every 5 minutes, according to the Eggs page, and each reset is a new roll. Use the odds to compare biomes, not to promise a time.
- The Halloween Dimension is the exception: the wiki says its numbers work like weights instead of percentages.
- Egg colour changes the look but not the income; the wiki says to judge an egg by its shape.
The rarest pet in each biome
| Biome | Rarest pet | Chance | About 1 in | Rarity | Income |
|---|---|---|---|---|---|
| Forest | Brr Brr Patapim | 1% | 100 | Legendary | $1.8K/s |
| Lake | Axolotl | 4.04% | 25 | Legendary | $2.8K/s |
| Desert | Royal Sphinx | 1.33% | 75 | Cosmic | $280K/s |
| Jungle | King Snake | 0.124% | 807 | Secret | $3.5M/s |
| Snow | Ice Dragon | 0.222% | 450 | Eternal | $65M/s |
| Volcano | Lava Dragon | 0.178% | 562 | Eternal | $100M/s |
| Abyss Ocean | El Maja | 0.089% | 1,125 | Eternal | $130M/s |
| Prehistoric | Mosasaurus | 0.311% | 321 | Eternal | $180M/s |
| Cosmic | Unicorn | 0.023% | 4,310 | Divine | $1B/s |
| Cherry Blossom | Kitsune | 0.02% | 5,000 | Divine | $1.8B/s |
| Titan Temple | Nightflame | 0.02% | 5,000 | Divine | $3B/s |
| Angels (12th biome) | ArchAngel | 0.02% | 5,000 | Divine | $5B/s |
| Demons (12th biome) | World Burner | 0.02% | 5,000 | Divine | $5B/s |
| Enchanted Forest | Royal Skywhale | 0.02% | 5,000 | Divine | $8B/s |
Moving from Abyss Ocean's El Maja ($130M/s, 1 in 1,125) to Cosmic's Unicorn ($1B/s, 1 in 4,310) multiplies income by about 7.7 while the odds get about 3.8 times worse. The best pets by income are ranked in the income guide.
Odds of a Secret or better
The table below adds the chances of every Secret, Eternal and Divine pet in the same biome. It answers the practical question of where a single egg is most likely to be a top-tier pet.
| Biome | Chance of Secret or better | About 1 in |
|---|---|---|
| Forest, Lake, Desert | 0% | none |
| Jungle | 0.12% | 807 |
| Snow | 0.59% | 168 |
| Abyss Ocean | 0.92% | 109 |
| Volcano | 1.02% | 98 |
| Cherry Blossom, Titan Temple, Enchanted Forest | 1.07% | 93 |
| Cosmic | 1.57% | 64 |
| Prehistoric | 2.13% | 47 |
| Angels or Demons | 5.43% | 18 |
| Angels and Demons (mixed) | 15% | 7 |
Among the ordinary biomes, Prehistoric has the best odds of a Secret or better at 2.13%, ahead of Cosmic and the three newest biomes. The catch is the Speed requirement: Prehistoric asks for 18M Speed, and the Speed guide covers how to reach it.
The curve the newer biomes share
Cherry Blossom, Titan Temple, the Angels and the Demons versions of the 12th biome, and the Enchanted Forest all use the same eight-slot curve:
| Slot | Chance |
|---|---|
| 1 | 37.51% |
| 2 | 26.27% |
| 3 | 16.83% |
| 4 | 13.96% |
| 5 | 4.36% |
| 6 (Secret) | 0.74% |
| 7 (Eternal) | 0.31% |
| 8 (Divine) | 0.02% |
That means slot 8 is always a 1 in 5,000 pet, slot 7 is about 1 in 323 and slot 6 is about 1 in 135. In Enchanted Forest, for example, slot 8 is Royal Skywhale, slot 7 is Celestial Sunlion and slot 6 is Starry Fox. See the Enchanted Forest guide for how to enter.
The 12th biome roll
The Angels & Demons slot is special because it can become one of three biomes:
| Version | Chance of being the 12th biome | Secret or better | Divine pets |
|---|---|---|---|
| Angels | 45% | 5.43% | ArchAngel (0.02%) |
| Demons | 45% | 5.43% | World Burner (0.02%) |
| Angels & Demons | 10% | 15% | ArchAngel and World Burner (0.03% each) |
The mixed version draws from both pools: Sacred Moth and Imp at 23.23% each, Holy Peacock and Demon Hound at 19.27%, Pure Jellyfish and Gargoyle at 6.02%, Centaur and RazorFang at 1.02%, Pegasus and Skeleton Horse at 0.43%, and the two Divine pets at 0.03%. The odds of a Secret or better triple, so it is the best case by far, but it appears only 1 time in 10. Our Angels and Demons guide lists all 16 pets and the Speed cost.
Full tables for the first biomes
The wiki gives these chances for every biome up to Prehistoric. Names follow the display names in our database.
- Forest: Chicken 34, Dog 24, Bird 17, Burrowing Owl 10, Raccoon 7, Fox 4.5, Bear 2.5, Brr Brr Patapim 1.
- Lake: Frog 29.27, Duckling 23.22, Catfish 17.16, Turtle 12.11, Trulimero Trulicina 8.08, Swan 5.55, Axolotl 4.04.
- Desert: Jerboa 26.59, Fennec 20.45, Camel 15.34, Tob Tobi Tob Tob 12.27, Snake 9.20, Sand Spider 8.18, Scorpion 6.65, Royal Sphinx 1.33.
- Jungle: Chimpanzee 26.01, Toucan 20.01, Crocodile 17.00, Gorilla 13.00, Orangutini Ananassini 11.00, Spider 7.85, Tiger 5.00, King Snake 0.124.
- Snow: Penguin 29.44, Walrus 21.57, Polar Bear 18.34, Sabertooth Tiger 14.02, Mammoth 11.86, King Mammoth 4.17, Yeti 0.37, Ice Dragon 0.22.
- Volcano: Lava Gecko 26.85, Lava Frog 22.04, Flaming Bull 18.03, Chillin Chilli 17.03, Lava Iguana 15.03, Cerberus 0.62, Phoenix 0.22, Lava Dragon 0.18.
- Abyss Ocean: Parrotfish 34.76, Swordfish 24.67, Shark 19.06, Orca 14.57, Whale Shark 3.41, Beluga Whale 2.62, Kraken 0.83, El Maja 0.09.
- Prehistoric: Dodo 39.07, Pterodactyl 26.04, Ankylosaurus 20.84, Bronto 7.00, Triceratops 4.93, T-Rex 0.99, Tralaledon 0.83, Mosasaurus 0.31.
- Cosmic: Centapede 39.87, Cosmic Gecko 34.39, Cosmic Gorilla 19.62, La Vacca Saturno Saturnita 4.55, Cosmic Dragon 0.74, Cosmic Skeleton Boss 0.50, Eternal Lunar Dragon 0.31, Unicorn 0.023.
The Lake list on the wiki adds up to 99.43%, so one entry or a small slice appears to be missing there.
Halloween Dimension zones
The wiki says the Halloween Dimension is split into three zones with weights rather than percentages:
- Graveyard: Whiskers 39.87, Jesterpop 34.39, Candlefang 19.62, Spirit Knight 4.55, Graveyard Brute 1.24, Ghost Reaper 0.31.
- Haunted Swamp: Hooded Gerbil 38.39, Toadstool 27.27, Patchwork Imp 18.83, Haunted Scorpio 13.96, BloodBloom 1.24, Shelltide Voyager 0.31.
- Abandoned Manor: Mimic Chest 43.1, Crowshade 37.51, Hexed Pumpkin 18.32, Werewolf 0.74, Abomination Kong 0.31, Voidseer Pumpkin 0.056.
Voidseer Pumpkin is the rarest at 0.056. Details are in the Halloween prep guide.
What to farm
- 1Early on, take the safest biome you can outrun. The wiki ties guardians to Speed, and the common pets in these biomes pay Speed rewards.
- 2For a Secret or better, Prehistoric has the best odds of the standard biomes at 2.13%, then Cosmic at 1.57%.
- 3For a Divine, the newest biomes all offer the same 1 in 5,000. Pick by the income of the Divine pet: $1.8B/s in Cherry Blossom, $3B/s in Titan Temple, $5B/s in Angels or Demons and $8B/s in Enchanted Forest.
- 4Watch for the mixed 12th biome. It has a 15% chance of a Secret or better.
Common mistakes
- Treating 1 in N as a guarantee. It is an average over many spawns.
- Comparing Halloween weights with percentages. They are a different scale.
- Chasing a Divine early. The Speed gate is higher than the odds suggest.
FAQ
What are the drop rates in Steal an Egg?
They are per-biome spawn chances that add up to 100%. The rarest pets sit between 0.02% and 1%.
What is the rarest pet in Steal an Egg?
In the standard biomes, the 0.02% Divine pets: Kitsune, Nightflame, ArchAngel, World Burner and Royal Skywhale.
Which biome has the best chance of a Secret pet?
Prehistoric, at 2.13% for a Secret or better, unless the 12th biome is the mixed Angels & Demons, which gives 15%.
How often does the mixed Angels & Demons biome appear?
10% of the time. Angels and Demons each appear 45%.
