Mosasaurus – Income, Rarity & How to Get
An Eternal pet from the Prehistoric collection — listed at $180M/s on the community reference list.
Overview
Mosasaurus is 1st of 8 in Prehistoric on the reference values this site holds, at $180M/s. The next one down is Tralaledon at $32M/s. That is about $648B an hour on the reference figure. Prehistoric opens at 17M Speed. Across all 90 pets with a confirmed value it ranks 8th. The Eternal label covers 12 pets on this site; 8 of them come with a confirmed reference value. The figure is a community reference rather than an official number, and a hatch can roll above or below it.
At a glance
| Biome | Prehistoric Endgame |
|---|---|
| Rarity | Eternal |
| Income per second | $180M/s |
| Per minute | $10.8B |
| Per hour | $648B |
| Per day | $15.55T |
| Rank in Prehistoric | 1 of 8 |
| Rank among Eternal pets | 4 of 8 |
| Rank overall | 8 of 90 reference pets |
| Speed needed for Prehistoric | 17M |
| Biome guardian | T-Rex |
| Collection type | Egg-pool pet |
| Data status | Community reference value |
| Last reviewed | 2026-09-19 |
Income per Second & Value
Reference income
On the community reference value, Mosasaurus is worth $180M/s — about $10.8B a minute, $648B an hour and $15.55T a day if the value holds. The next one down is Tralaledon at $32M/s.
The listed value is the base one and the roll is a range, so no two copies have to agree with it. Nothing here is a trade price either: it is the reference value this site tracks for Mosasaurus.
Size and Mutation variance
Size and Mutation both modify a pet on top of its base value, and this site publishes no multiplier for either. The practical consequence: $180M/s is the reference, and a real copy can sit above it. Model a session with the income calculator, which uses this figure rather than a made-up bonus.
Rarity & Availability
Rarity label
Mosasaurus is Eternal — band 9 of ten rarity labels here, out of 12 pets carrying the label and 8 with a confirmed value. The label files the pet; it does not rank it. Income does the ranking, and the full band is collected on the Eternal pets page.
Acquisition/source
It is an egg-pool pet, listed in the Prehistoric collection — Endgame tier, and it opens at 17M Speed. The collection is described in full on the Prehistoric page.
How to Get Mosasaurus
Egg or event source
The egg that produces Mosasaurus is not something this page can name without guessing, so it does not try. Confirmed: the pet sits in the Prehistoric egg pool, as listed on the Prehistoric table. Hatch odds and drop rates are not published anywhere this site could check, so they are absent by choice rather than by oversight.
Requirements/progression gate
Prehistoric opens at 17M Speed, and its guardian is T-Rex. Hatching happens on the map, so the pet is reachable only from a run that has already opened that biome. Its tier labelling is Endgame. The whole ladder is on the Prehistoric page.
Mosasaurus in Prehistoric
Related pets
The full pool Mosasaurus belongs to, highest reference value first. Values are the same ones used across this site.
| Pet | Rarity | Income / sec |
|---|---|---|
| Mosasaurus — this page | Eternal | $180M/s |
| Tralaledon | Secret | $32M/s |
| TRex | Secret | $25M/s |
| Bronto | Cosmic | $1.5M/s |
| Triceratops | Cosmic | $1.2M/s |
| Ankylosaurus | Mythic | $120K/s |
| Pterodactyl | Legendary | $22K/s |
| Dodo | Rare | $280/s |
Biome progression context
Of the 112 pets tracked here, 8 belong to Prehistoric, 8 of them with a confirmed reference value, and it is labelled Endgame. Abyss Ocean comes before it in the ladder, at 2.5M Speed. The next gate after Prehistoric is Cosmic at 700M Speed. The collection page lists every pet and every gate in it: Prehistoric.
Mosasaurus vs Other Eternal Pets
Income comparison
Every Eternal pet this site tracks, highest reference value first. The list spans more than one collection.
| Pet | Rarity | Collection | Income / sec |
|---|---|---|---|
| Gorilla King | Eternal | Titan Temple | $880M/s |
| Oni Tiger | Eternal | Cherry Blossom | $600M/s |
| Eternal Lunar Dragon | Eternal | Cosmic | $250M/s |
| Mosasaurus — this page | Eternal | Prehistoric | $180M/s |
| El Maja | Eternal | Abyss Ocean | $130M/s |
| Lava Dragon | Eternal | Volcano | $100M/s |
| Phoenix | Eternal | Volcano | $85M/s |
| Ice Dragon | Eternal | Snow | $65M/s |
| Equinox | Eternal | Angels & Demons | unverified |
| Pegasus | Eternal | Angels & Demons | unverified |
| Skeleton Horse | Eternal | Angels & Demons | unverified |
| Strawberry Elephant | Eternal | Brainrot (Limited) | unverified |
The Eternal label covers 12 pets across 9 collections, so these are not all neighbours in progression — the comparison is by label, not by where each pet sits in the Speed ladder.
Practical use
Inside Prehistoric it is the highest reference value listed, so it is the pet that collection is aiming at. At $648B an hour it is an endgame figure on this site's scale.
Related Eggs, Pets & Tools
Prehistoric
The collection Mosasaurus belongs to, with its gate, its guardian and every pet in it.
Open the Prehistoric pageIncome calculator
Put a per-second value against minutes, hours or a whole session.
Open the calculatorSpeed → biome checker
See which collections a given Speed figure has already opened.
Check a Speed figureOther pets to compare it with: Tralaledon, TRex, Bronto, Triceratops, Gorilla King, Oni Tiger. The full roster is on the pet and egg list, and the ranking across tiers is on the tier list.
FAQ
What is Mosasaurus in Steal An Egg?
Mosasaurus is an Eternal pet in the Prehistoric collection in Steal An Egg, listed at $180M/s on the community reference list. That places it 1st of 8 in Prehistoric and 8th of 90 site-wide.
What rarity is Mosasaurus?
Eternal-tier. 12 pets here carry that label, 8 of them with a confirmed value, and Mosasaurus ranks 4th among those.
How much does Mosasaurus earn per second?
The community reference value is $180M/s — about $10.8B a minute and $648B an hour if the value holds. A hatch can roll above or below it.
How do you get Mosasaurus?
It is an egg-pool pet of the Prehistoric collection. Prehistoric opens at 17M Speed, and its guardian is T-Rex. That is the only confirmed part: the pet is listed in the Prehistoric collection, and this site does not infer an egg name from the collection name alone.
Which egg contains Mosasaurus?
The egg is not named on this page because it could not be confirmed. What is on record is the collection, Prehistoric.
Where is Mosasaurus found?
Prehistoric (Endgame). Prehistoric opens at 17M Speed, and it is guarded by T-Rex.
Does size or mutation affect Mosasaurus income?
No verified multipliers are published on this site, so none are printed. Size and Mutation stack on top of the base value, so your own copy can read above or below $180M/s.