Steal An Egg IndexMosasaurus in Steal An Egg
Eternal · wiki data synced Oct 24, 2026
Mosasaurus is a Eternal pet that earns $180M/s at its base size of 30,000 kg. It hatches from eggs stolen in Prehistoric, where about 1 in 321 eggs is a Mosasaurus egg (0.311113%).
It is #76 of 236 pets by base income, and #1 of 8 in Prehistoric.
- Rarity
- Eternal
- Base income
- $180M/s
- Base size
- 30,000 kg
- Zone
- Prehistoric
- Speed needed
- 17M – 18M
- Egg
- Mosasaurus Egg
- Drop chance
- 0.31% (1 in 321)
- Grow time
- 6h
- Reward
- +600k Speed, $18b
How to get Mosasaurus
Train until you have at least 17M – 18M Speed, then go to Prehistoric, zone 8 of 14, guarded by the T-Rex. Steal eggs there and bring them back to your base to hatch.
Each egg that spawns in Prehistoric has a 0.311113% chance to be a Mosasaurus Egg. That means you need to see about 223 eggs for a 50% chance of at least one, and 739 eggs for 90%.
A Mosasaurus egg takes 6h to hatch, and the wiki lists its reward as +600k Speed, $18b.
Mosasaurus value by size and mutation
Income grows with weight but slows down past 125× the base size. These are the wiki's formula at three sizes:
| Size | Normal | Golden ×2.5 | Rainbow ×3.5 |
|---|---|---|---|
| 30,000 kg (base) | $180M/s | $450M/s | $630M/s |
| 300,000 kg | $745M/s | $1.86B/s | $2.61B/s |
| 3,000,000 kg | $3.08B/s | $7.7B/s | $10.8B/s |
Work out your own Mosasaurus: open it in the income calculator. All multipliers are on the mutations page.
How Mosasaurus compares
By base income Mosasaurus is #76 of 236 overall and #26 of 30 Eternal pets. Just above it: Electric Eel ($200M/s); just below: Three Headed Chicken ($165M/s).
Other pets in Prehistoric
| Pet | Rarity | Base $/s | Drop chance |
|---|---|---|---|
 Dodo | Rare | $280/s | 39.1% |
 Pterodactyl | Legendary | $22K/s | 26% |
 Ankylosaurus | Mythic | $120K/s | 20.8% |
 Bronto | Cosmic | $1.5M/s | 7% |
 Triceratops | Cosmic | $1.2M/s | 4.93% |
 T-Rex | Secret | $25M/s | 0.99% (1 in 101) |
 Tralaledon | Secret | $32M/s | 0.83% (1 in 121) |
| Mosasaurus | Eternal | $180M/s | 0.31% (1 in 321) |
Source: Mosasaurus on the Steal An Egg Wiki (CC BY-SA). First listed on the wiki Sep 2, 2026, during the Monsters Are Coming week. Synced Oct 24, 2026.