All pets
PET
MOSASAURUS EGG
Mosasaurus
Eternal
$180M/s
Wiki data synced Oct 24, 2026 · on the wiki since Sep 2, 2026
Base income
$180M/s
Found in
Prehistoric
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Drop chance
0.31% (1 in 321)
Base size
30,000 kg
Steal reward
+600k Speed, $18b
Grow time
6h
STATS
About 1 in 321 eggs that spawn in Prehistoric is a Mosasaurus.
223
eggs · 50% chance
739
eggs · 90% chance
Eggs you need to see to get at least one, from the wiki's spawn chances.
HATCH ODDS
Size
Normal
Golden
Rainbow
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
Same formula as the calculator. Golden ×2.5, Rainbow ×3.5; pets can carry more than one mutation.
INCOME BY SIZE
Also in Prehistoric
Dodo · Pterodactyl · Ankylosaurus · Bronto · Triceratops · T-Rex · Tralaledon
RELATED PETS
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Mosasaurus on the Steal An Egg Wiki
Community data from the Steal An Egg Wiki (CC BY-SA) · Updated Oct 24, 2026