Steal an Egg · Pet
Skeletal Terrorbird
Skeletal Terrorbird is a Secret pet in Steal an Egg that earns a base $750M/s. It hatches from the Skeletal Egg (Skeletal Egg).
EggSkeletal EggPet stats
Base income
$750M/s
Base weight
6,000 kg
Egg
Skeletal Egg
Grow time
—
Speed reward
—
Cash reward
—
Source
Skeletal Egg
Special egg
Rarity
Secret
Where to get Skeletal Terrorbird
Skeletal Terrorbird hatches from the Skeletal Egg, part of the Skeletal Egg group. According to the wiki, limited eggs like this do not spawn in the regular biome nests: they come from the Store or from special events such as Admin Abuse.
Estimate based on the wiki formula
Skeletal Terrorbird income with mutations and size
| Mutation | 1× weight6,000 kg | 10× weight60,000 kg | 100× weight600,000 kg | 200× weight1,200,000 kg |
|---|---|---|---|---|
| No mutation×1 | $750M/s | $3.1B/s | $12.8B/s | $17.8B/s |
| Rainbow×3.5 | $2.63B/s | $10.9B/s | $44.9B/s | $62.2B/s |
| Parasite×3 | $2.25B/s | $9.31B/s | $38.5B/s | $53.3B/s |
| Fractured×2.75 | $2.06B/s | $8.53B/s | $35.3B/s | $48.9B/s |
| Scrambled×2.75 | $2.06B/s | $8.53B/s | $35.3B/s | $48.9B/s |
| Golden×2.5 | $1.88B/s | $7.76B/s | $32.1B/s | $44.4B/s |
| Spirit Bloom×2.5 | $1.88B/s | $7.76B/s | $32.1B/s | $44.4B/s |
| Bloom×1.25 | $938M/s | $3.88B/s | $16B/s | $22.2B/s |
| Silver×1.2 | $900M/s | $3.72B/s | $15.4B/s | $21.3B/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 Skeletal Terrorbird compares
Neighbors by income in Skeletal Egg (5 of 10):
Earns less
Skeletal Glyptodon
$550M/s(÷1.36 vs Skeletal Terrorbird)
Earns more
Skeletal Giant Sloth
$900M/s(×1.2 vs Skeletal Terrorbird)
Other Secret pets
Skeletal Terrorbird guide
Skeletal Terrorbird is a Secret that earns as much as an Eternal. Its $750M/s matches Terra Snapper from the Luminous Egg exactly, and it beats Oni Tiger, the Eternal of Cherry Blossom ($600M/s).
The re-roll behind it
Update 6 brought the paid Extinction Egg, with 6 extinct animals and a small chance for each hatch to re-roll into a rare Skeletal version. Skeletal Terrorbird is that re-roll for Terrorbird, which earns only $110K/s as a plain Mythic; the Skeletal form is about 6,800 times better. The wiki lists it in its Skeletal Egg group and doesn't give re-roll odds, a grow time or a hatch reward. As a store-side egg, there's no Speed requirement or guardian to deal with.
The Skeletal line, top to bottom
- Skeletal Sabertooth, Divine, $9B/s
- Skeletal Gigantus, Eternal, $4B/s
- Skeletal Dunkleosteus, Eternal, $2.5B/s
- Skeletal Giant Sloth, Secret, $900M/s
- Skeletal Terrorbird, Secret, $750M/s
- Skeletal Glyptodon, Secret, $550M/s
It's 5th of 35 Secret pets, and 36 of the game's 198 pets earn more.
Estimates
It keeps Terrorbird's 6,000 kg base weight. With the formula the wiki documents:
- Golden: about $1.88B/s
- Rainbow: about $2.62B/s
- 10x base weight: about $3.1B/s
- 100x base weight: about $12.8B/s
- 200x base weight: about $17.8B/s
- Rainbow at 100x weight: about $44.9B/s
A Rainbow Skeletal Terrorbird would outpace a plain Skeletal Dunkleosteus, and a 10x one would close in on Skeletal Gigantus. Since mutations and size are rolled separately at hatch, a heavy Skeletal Terrorbird can end up stronger than a lighter copy of a higher Skeletal pet.
Data sourced from the Steal an Egg Wiki (CC BY-SA) and processed automatically; last synced 2026-10-11.