Steal An Egg Prehistoric: Eggs, Pets & Speed

Zone 8 of 14 · 8 pets · wiki data synced Oct 25, 2026

Prehistoric is zone 8 of 14 in Steal An Egg (the game's own updates call zones biomes). You need 17M – 18M Speed to enter, and 8 egg types spawn there, from the Dodo Egg (39.1%) to the Mosasaurus Egg (1 in 321). An average Prehistoric egg hatches into $1.27M/s of base income. Below: every Prehistoric egg with its drop chance and how many eggs you need, each pet's value, how to reach the Speed, and how Prehistoric compares with Abyss Ocean and Cosmic.

All eggs in Prehistoric: egg list, chances and pets

Dodo Egg Hatches Dodo 39.1% Pterodactyl Egg Hatches Pterodactyl 26% Ankylosaurus Egg Hatches Ankylosaurus 20.8% Bronto Egg Hatches Bronto 7% Triceratops Egg Hatches Triceratops 4.93% T-Rex Egg Hatches T-Rex 0.99% Tralaledon Egg Hatches Tralaledon 0.83% Mosasaurus Egg Hatches Mosasaurus 0.31%

Pet	Rarity	Base $/s	Chance	Eggs for 50%	Eggs for 90%	Hatch	Hatch reward
Dodo	Rare	$280/s	39.1%	2	5	1m 30s	+240k Speed, $28k
Pterodactyl	Legendary	$22K/s	26%	3	8	3m	+270k Speed, $2.2m
Ankylosaurus	Mythic	$120K/s	20.8%	3	10	5m	+330k Speed, $12m
Bronto	Cosmic	$1.5M/s	7%	10	32	11m	+300k Speed, $150m
Triceratops	Cosmic	$1.2M/s	4.93%	14	46	8m	+360k Speed, $120m
T-Rex	Secret	$25M/s	0.99% (1 in 101)	70	232	2h 30m	+420k Speed, $2.5b
Tralaledon	Secret	$32M/s	0.83% (1 in 121)	84	278	3h	+480k Speed, $3.2b
Mosasaurus	Eternal	$180M/s	0.31% (1 in 321)	223	739	6h	+600k Speed, $18b

"Eggs for 50%": how many Prehistoric eggs you need to see for an even chance of at least one of that pet. It uses the wiki's spawn chances: 1 − (1 − p)ⁿ. "Hatch reward": the Speed and cash the wiki lists for hatching that egg.

What is Prehistoric in Steal An Egg?

Prehistoric holds 8 pets on the wiki: 1 Rare, 1 Legendary, 1 Mythic, 2 Cosmic, 2 Secret, 1 Eternal. By base income they run from Mosasaurus (Eternal, $180M/s) down to Dodo (Rare, $280/s), a spread of 642,857×.

It sits at position 8 on the Speed ladder: Abyss Ocean (2.5M) comes before it and Cosmic (700M) after it. The Speed step from Abyss Ocean to Prehistoric is 6.8×. From Prehistoric to Cosmic it is 41×.

The spawn chances on the wiki add up to 100%. 8 egg types have a chance listed.

Hatch times run from 1m 30s for the Dodo Egg to 6h for the Mosasaurus Egg, as the wiki lists them.

The wiki first listed Prehistoric pets on Sep 1, 2026 and the newest on Sep 4, 2026. Those are wiki page dates, not the game's patch notes.

How to unlock Prehistoric

You need 17M – 18M Speed to enter Prehistoric. By the wiki's treadmill numbers that is 8,500,000 steps on the base Treadmill (+2 Speed per step) or 5,667 on the Astral Treadmill (+3k Speed per step). Trails multiply Speed on top, up to 20× with the Moonbloom Trail; prices are on the treadmills and trails page.

To get here you pass Forest (None), Lake (900), Desert (10K), Jungle (40K), Snow (Not listed yet), Volcano (700K), Abyss Ocean (2.5M).

Hatching eggs in Prehistoric also gives Speed and cash, as the wiki lists under each egg's reward: Dodo Egg +240k Speed, $28k; Pterodactyl Egg +270k Speed, $2.2m; Ankylosaurus Egg +330k Speed, $12m; Bronto Egg +300k Speed, $150m; Triceratops Egg +360k Speed, $120m; T-Rex Egg +420k Speed, $2.5b; Tralaledon Egg +480k Speed, $3.2b; Mosasaurus Egg +600k Speed, $18b.

Before it: Abyss Ocean (2.5M Speed). Next: Cosmic needs 700M Speed. Speed comes from treadmills and trails: see treadmill and trail prices or the full Speed ladder.

Which Prehistoric eggs are worth it

Weighted by the wiki's spawn chances, one random Prehistoric egg is worth $1.27M/s of base income. 4 pets beat that average: Mosasaurus (Eternal, $180M/s), Tralaledon (Secret, $32M/s), T-Rex (Secret, $25M/s), Bronto (Cosmic, $1.5M/s). Mosasaurus alone accounts for 44% of the average, because its chance and value together outweigh the others.

The rarest egg, the Mosasaurus Egg, hatches Mosasaurus ($180M/s), 142× the zone average. You need about 223 Prehistoric eggs for an even chance at one and 739 for 90%; at the zone average those 223 eggs would hatch about $283M/s of other pets along the way.

Moving on pays: an average Cosmic egg is worth $1.83M/s, 1.44× a Prehistoric egg, but it needs 700M Speed. Coming from Abyss Ocean, Prehistoric eggs are worth 4.2× as much as what you left.

Size and mutations change all of this: a Rainbow Mosasaurus earns $630M/s at base size, and a bigger one more still. The income calculator does the arithmetic for any weight.

Every Prehistoric pet at a glance

Mosasaurus

Mosasaurus is an Eternal pet worth $180M/s at base size (30,000 kg), $648B an hour; #91 of 265 overall. Golden makes it $450M/s and Rainbow $630M/s. Its Mosasaurus Egg is 0.31% (1 in 321) of Prehistoric spawns: about 223 eggs for a 50% chance. Hatch time 6h. Listed on the wiki Sep 2, 2026, the Monsters Are Coming week.

Tralaledon

Tralaledon is a Secret pet worth $32M/s at base size (1,000 kg), $115B an hour; #112 of 265 overall. Golden makes it $80M/s and Rainbow $112M/s. Its Tralaledon Egg is 0.83% (1 in 121) of Prehistoric spawns: about 84 eggs for a 50% chance. Hatch time 3h. Listed on the wiki Sep 4, 2026, the Monsters Are Coming week.

T-Rex

T-Rex is a Secret pet worth $25M/s at base size (7,500 kg), $90B an hour; #120 of 265 overall. Golden makes it $62.5M/s and Rainbow $87.5M/s. Its T-Rex Egg is 0.99% (1 in 101) of Prehistoric spawns: about 70 eggs for a 50% chance. Hatch time 2h 30m. Listed on the wiki Sep 4, 2026, the Monsters Are Coming week.

Bronto

Bronto is a Cosmic pet worth $1.5M/s at base size (35,000 kg), $5.4B an hour; #159 of 265 overall. Golden makes it $3.75M/s and Rainbow $5.25M/s. Its Bronto Egg is 7% of Prehistoric spawns: about 10 eggs for a 50% chance. Hatch time 11m. Listed on the wiki Sep 4, 2026, the Monsters Are Coming week.

Triceratops

Triceratops is a Cosmic pet worth $1.2M/s at base size (3,500 kg), $4.32B an hour; #167 of 265 overall. Golden makes it $3M/s and Rainbow $4.2M/s. Its Triceratops Egg is 4.93% of Prehistoric spawns: about 14 eggs for a 50% chance. Hatch time 8m. Listed on the wiki Sep 4, 2026, the Monsters Are Coming week.

Ankylosaurus

Ankylosaurus is a Mythic pet worth $120K/s at base size (2,500 kg), $432M an hour; #196 of 265 overall. Golden makes it $300K/s and Rainbow $420K/s. Its Ankylosaurus Egg is 20.8% of Prehistoric spawns: about 3 eggs for a 50% chance. Hatch time 5m. Listed on the wiki Sep 1, 2026, the Monsters Are Coming week.

Pterodactyl

Pterodactyl is a Legendary pet worth $22K/s at base size (180 kg), $79.2M an hour; #216 of 265 overall. Golden makes it $55K/s and Rainbow $77K/s. Its Pterodactyl Egg is 26% of Prehistoric spawns: about 3 eggs for a 50% chance. Hatch time 3m. Listed on the wiki Sep 4, 2026, the Monsters Are Coming week.

Dodo

Dodo is a Rare pet worth $280/s at base size (20 kg), $1.01M an hour; #244 of 265 overall. Golden makes it $700/s and Rainbow $980/s. Its Dodo Egg is 39.1% of Prehistoric spawns: about 2 eggs for a 50% chance. Hatch time 1m 30s. Listed on the wiki Sep 4, 2026, the Monsters Are Coming week.

Prehistoric compared with Abyss Ocean and Cosmic

Prehistoric FAQ

Short answers to the questions people search for about Prehistoric, computed from the wiki's numbers synced Oct 25, 2026.

What Speed do you need for Prehistoric in Steal An Egg?

17M – 18M Speed. The zone before it, Abyss Ocean, needs 2.5M, and the one after, Cosmic, needs 700M. On the free treadmill that is 8,500,000 steps at +2 Speed per step.

Which Eternal pets are in Prehistoric?

One: Mosasaurus ($180M/s, 0.31% (1 in 321) of spawns). Eternal is tier 9 of 13 on the wiki's list; Prehistoric holds 8 pets across 6 rarities.

Which Secret pets are in Prehistoric?

2: Tralaledon ($32M/s, 0.83% (1 in 121) of spawns), T-Rex ($25M/s, 0.99% (1 in 101) of spawns). Secret is tier 8 of 13 on the wiki's list; Prehistoric holds 8 pets across 6 rarities.

Is there a Prehistoric egg predictor?

No working one. Egg spawns are random per server, so nothing can read which egg comes next; "predictors" and "notifiers" guess. The published odds are the wiki's spawn chances in the table above, and the "eggs for 50% / 90%" columns turn them into how many eggs you need to see.

What is the rarest egg in Prehistoric?

The Mosasaurus Egg, at 0.31% (1 in 321) of spawns. It hatches Mosasaurus (Eternal, $180M/s). You need about 223 eggs for a 50% chance and 739 for 90%. The second rarest is the Tralaledon Egg at 0.83% (1 in 121).

What is the most common egg in Prehistoric?

The Dodo Egg, 39.1% of spawns, which hatches Dodo (Rare, $280/s). Dodo earns 1/4,526 of the zone's average egg value of $1.27M/s.

What is the best pet in Prehistoric?

Mosasaurus, a Eternal pet worth $180M/s at base size, from the Mosasaurus Egg at 0.31% (1 in 321). Second is Tralaledon at $32M/s, third T-Rex at $25M/s. Overall Mosasaurus is #91 of 265 pets.

How much is a Prehistoric egg worth?

On average $1.27M/s of base income per egg, weighting each pet by the wiki's spawn chance. Most of that comes from Mosasaurus (44% of the average). An average Cosmic egg is worth $1.83M/s. An average Abyss Ocean egg is worth $301K/s.

How many pets are in Prehistoric?

8 pets on the wiki: 1 Rare, 1 Legendary, 1 Mythic, 2 Cosmic, 2 Secret, 1 Eternal. The full list with pictures is in the egg gallery.

What comes after Prehistoric?

Cosmic, zone 9, which needs 700M Speed. Its average egg is worth $1.83M/s, 1.44× a Prehistoric egg. The whole ladder is on the zones page.

When was Prehistoric added to Steal An Egg?

The wiki listed its first pets on Sep 1, 2026 and its newest on Sep 4, 2026. No official listing names it, so the wiki date is the closest record.

What mutations can Prehistoric pets have?

Any mutation applies to any pet: on the wiki Silver (6 in 100), Golden (4 in 100) and Rainbow (1 in 100) come from the hatch roll, and the rest from events or consumables. A Golden Mosasaurus earns $450M/s and a Rainbow one $630M/s; all multipliers are on the mutations page.

How rare is a Rainbow Mosasaurus?

On the wiki Rainbow is a 1 in 100 roll on any hatch and the Mosasaurus Egg is 1 in 321 Prehistoric eggs, so a Rainbow Mosasaurus is roughly 1 in 32,100 eggs if the rolls are independent. It would earn $630M/s at base size; Golden (4 in 100) gives $450M/s.

Source: Prehistoric on the Steal An Egg Wiki (CC BY-SA). Synced Oct 25, 2026.