Steal an Egg · Pet
Toxic Rat
Toxic Rat is a Mythic pet in Steal an Egg that earns a base $180K/s. It hatches from the Biohazard Egg (Biohazard Egg).
EggBiohazard EggPet stats
Base income
$180K/s
Base weight
8 kg
Egg
Biohazard Egg
Grow time
—
Speed reward
—
Cash reward
—
Source
Biohazard Egg
Special egg
Rarity
Mythic
Where to get Toxic Rat
Toxic Rat hatches from the Biohazard Egg, part of the Biohazard Egg group. According to the wiki, limited eggs like this do not spawn in the regular biome nests: they come from the Store or from special events such as Admin Abuse.
Other pets from the Biohazard Egg
Estimate based on the wiki formula
Toxic Rat income with mutations and size
| Mutation | 1× weight8 kg | 10× weight80 kg | 100× weight800 kg | 200× weight1,600 kg |
|---|---|---|---|---|
| No mutation×1 | $180K/s | $745K/s | $3.08M/s | $4.27M/s |
| Rainbow×3.5 | $630K/s | $2.61M/s | $10.8M/s | $14.9M/s |
| Parasite×3 | $540K/s | $2.23M/s | $9.24M/s | $12.8M/s |
| Fractured×2.75 | $495K/s | $2.05M/s | $8.47M/s | $11.7M/s |
| Scrambled×2.75 | $495K/s | $2.05M/s | $8.47M/s | $11.7M/s |
| Golden×2.5 | $450K/s | $1.86M/s | $7.7M/s | $10.7M/s |
| Spirit Bloom×2.5 | $450K/s | $1.86M/s | $7.7M/s | $10.7M/s |
| Bloom×1.25 | $225K/s | $931K/s | $3.85M/s | $5.33M/s |
| Silver×1.2 | $216K/s | $894K/s | $3.7M/s | $5.12M/s |
Estimate based on the wiki formula (marked beta there): income = base × (weight ÷ base weight)^(37/60) × mutation, with diminishing returns above 125× the base weight. In-game values can differ. See mutations and the income calculator.
How Toxic Rat compares
Neighbors by income in Biohazard Egg (1 of 5):
Earns more
Radcoon
$2.2M/s(×12 vs Toxic Rat)
Other Mythic pets
Toxic Rat guide
With a base weight of just 8 kg, Toxic Rat is one of the lightest pets in Steal an Egg, and at $180K/s it is the entry pet of the Biohazard Egg from Dr. Scramble's Laboratory.
The Biohazard banner
Update 6 replaced the Rift Trade-In Machine with Dr. Scramble's Laboratory and gave it three rotating banners: Biohazard, Experimental and Unstable DNA. Each banner asks for pets tied to its pool, and since Update 6 you can hand in eggs directly instead of hatching them first. Pity was also buffed: hitting it now guarantees the banner's top reward.
Biohazard is the banner that draws from the earliest biomes of the three: Prehistoric, Cosmic and Cherry Blossom eggs. Its requested pets go from a Rare Dodo and Epic Centapede and Crane up to Cosmic-rarity picks like Triceratops, Bronto, La Vacca Saturno Saturnita, Koi and Snowy Owl. If you are still farming Prehistoric (18M Speed), this is the Laboratory banner you can feed most easily.
The Biohazard Egg's pets, from lowest to highest:
- Toxic Rat, Mythic, $180K/s
- Radcoon, Cosmic, $2.2M/s
- Toucax, Cosmic, $30M/s
- Nuceodile, Secret, $500M/s
- Nuclear Mantis, Eternal, $1.5B/s
What 8 kg means for weight rolls
Because the formula the wiki documents works on the ratio to base weight, a 100x Toxic Rat is only 800 kg. Estimates:
- Golden: about $450K/s
- Rainbow: about $630K/s
- 100x base weight: about $3.08M/s
- Rainbow at 100x weight: about $10.8M/s
The Experiment Shop also sells a Scrambled Mutation (475 Samples, 10% chance to apply, x2.75), which would put a plain Toxic Rat near $495K/s. It ranks 10th of 23 Mythic pets, tied with Cosmic Gorilla.
Data sourced from the Steal an Egg Wiki (CC BY-SA) and processed automatically; last synced 2026-10-11.