Steal an Egg · Pet
King Mammoth
King Mammoth is a Cosmic pet in Steal an Egg that earns a base $400K/s. It hatches from the King Mammoth Egg, stolen from the nests of the Snow biome.
EggKing Mammoth EggPet stats
Base income
$400K/s
Base weight
25,000 kg
Egg
King Mammoth Egg
Grow time
15m
Speed reward
+22.4K
Cash reward
$40M
Source
Snow
Biome nest
Rarity
Cosmic
Where to get King Mammoth
Steal the King Mammoth Egg from the nests of the Snow biome, carry it back to your pen and let it hatch.
- Speed required
- 170K
- Guardian
- Yeti
The guardian sleeps next to the nest; the faster you are, the easier it is to outrun it. Bigger eggs are worth more but slow you down. Eggs & guardians
Estimate based on the wiki formula
King Mammoth income with mutations and size
| Mutation | 1× weight25,000 kg | 10× weight250,000 kg | 100× weight2,500,000 kg | 200× weight5,000,000 kg |
|---|---|---|---|---|
| No mutation×1 | $400K/s | $1.65M/s | $6.85M/s | $9.48M/s |
| Rainbow×3.5 | $1.4M/s | $5.79M/s | $24M/s | $33.2M/s |
| Parasite×3 | $1.2M/s | $4.96M/s | $20.5M/s | $28.4M/s |
| Fractured×2.75 | $1.1M/s | $4.55M/s | $18.8M/s | $26.1M/s |
| Scrambled×2.75 | $1.1M/s | $4.55M/s | $18.8M/s | $26.1M/s |
| Golden×2.5 | $1M/s | $4.14M/s | $17.1M/s | $23.7M/s |
| Spirit Bloom×2.5 | $1M/s | $4.14M/s | $17.1M/s | $23.7M/s |
| Bloom×1.25 | $500K/s | $2.07M/s | $8.56M/s | $11.8M/s |
| Silver×1.2 | $480K/s | $1.99M/s | $8.21M/s | $11.4M/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 King Mammoth compares
Neighbors by income in Snow (6 of 8):
Other Cosmic pets
King Mammoth guide
The most time-efficient early Cosmic
Fifteen minutes is short for a Cosmic egg. The Lake's Leviathan takes 25 and the Desert's Royal Sphinx takes 30, yet the King Mammoth out-earns both at $400K/s. It is the Cosmic of Snow, ranked 25th of 28 Cosmics and 125th of 198 overall.
King Mammoth Egg
- Grow time: 15 minutes
- Reward: +22.4k Speed and $40m
- Base weight: 25,000 kg
Fifteen minutes is three of the wiki's 5-minute nest resets. Compare that with the cycles the earlier Cosmics occupy:
- Leviathan: $220K/s, five resets
- Royal Sphinx: $280K/s, six resets
- King Mammoth: $400K/s, three resets
If you have been keeping a Royal Sphinx running since the Desert, the King Mammoth gives you about 43% more income for half the wait.
A 25-tonne base
At 25,000 kg, the King Mammoth has the heaviest base weight of any pet in the first six biomes. Size multipliers are measured against that number, so even an extraordinarily large King Mammoth Egg will often sit near its base multiplier. Estimates from the formula the wiki documents:
- Golden: about $1M/s
- Rainbow: about $1.4M/s
- 10 times base weight: about $1.65M/s
- 100 times base weight: about $6.85M/s
- 200 times base weight: about $9.48M/s
- Rainbow at 100 times base weight: about $24M/s
Rift and next steps
The wiki places the King Mammoth in the Hard tier of Riftborn sacrifices, so it is one of the pricier pets the lobby Rift can request. Above it in Snow sit two much bigger eggs: the Yeti (Secret, $5M/s, 1:45) and the Ice Dragon (Eternal, $65M/s, 4 hours).
Data sourced from the Steal an Egg Wiki (CC BY-SA) and processed automatically; last synced 2026-10-11.