Steal An Egg Biohazard Egg Pets

Special source · 6 pets · wiki data synced Oct 25, 2026

Biohazard Egg pets in Steal An Egg: 6 pets that do not hatch from zone nests but come from the Biohazard Egg. The best earner is Nuclear Mantis at $1.5B/s, the lowest Toxic Rat at $180K/s. Below: every pet with its rarity and base income, which update brought the source, how these pets compare with zone eggs, and the questions people ask about them.

All Biohazard Egg pets

Biohazard Egg Hatches Nuclear Mantis $1.5B/s Biohazard Egg Hatches Nuceodile $500M/s Hazardhog Hatches Hazardhog $500M/s Biohazard Egg Hatches Toucax $30M/s Biohazard Egg Hatches Radcoon $2.2M/s Biohazard Egg Hatches Toxic Rat $180K/s

Pet	Rarity	Base $/s	Hatch
Nuclear Mantis	Eternal	$1.5B/s	—
Nuceodile	Secret	$500M/s	5 mins
Hazardhog	Eternal	$500M/s	—
Toucax	Cosmic	$30M/s	—
Radcoon	Cosmic	$2.2M/s	—
Toxic Rat	Mythic	$180K/s	—

What is the Biohazard Egg in Steal An Egg?

The Biohazard Egg holds 6 pets on the wiki: 1 Mythic, 2 Cosmic, 1 Secret, 2 Eternal. By base income they run from Nuclear Mantis (Eternal, $1.5B/s) down to Toxic Rat (Mythic, $180K/s), a spread of 8,333×.

These pets are not tied to a zone, so Speed does not unlock them. The wiki does not say which update introduced the source.

The wiki first listed the Biohazard Egg pets on Sep 27, 2026. Those are wiki page dates, not the game's patch notes.

How to get Biohazard Egg pets

Biohazard Egg pets come from the Biohazard Egg, not from a zone, so there is no Speed requirement and no nest to camp. The wiki gives no spawn chance for any of them, so we cannot say how many eggs one takes.

Sources like this come and go with the weekly Saturday updates, and the wiki does not mark which are still open. The updates page shows what is live now and the countdown to the next update.

Are Biohazard Egg pets worth it?

The wiki gives no spawn chances here, so there is no "average egg" to compute; the values are what each pet earns at base size. No zone's average egg matches Nuclear Mantis.

Measured against the zone ladder: Nuclear Mantis ($1.5B/s) is first out-earned by a zone pet in Cherry Blossom, where Kitsune makes $1.8B/s; Nuceodile ($500M/s) is first out-earned by a zone pet in Cosmic, where Unicorn makes $1B/s; Hazardhog ($500M/s) is first out-earned by a zone pet in Cosmic, where Unicorn makes $1B/s; Toucax ($30M/s) is first out-earned by a zone pet in Snow, where Ice Dragon makes $65M/s; Radcoon ($2.2M/s) is first out-earned by a zone pet in Jungle, where King Snake makes $3.5M/s.

Size and mutations change all of this: a Rainbow Nuclear Mantis earns $5.25B/s at base size, and a bigger one more still. The income calculator does the arithmetic for any weight.

Biohazard Egg pets against the zone ladder

For each pet: the first zone whose average egg is worth as much, and the first zone whose best pet earns as much. "None" means no zone reaches it.

What Biohazard Egg pets earn per hour and per day

Base income per second, minute, hour and day for every Biohazard Egg pet with a listed value, at base size with no mutation. Size changes it: Nuclear Mantis at ten times its base weight (20,000 kg) earns $6.21B/s, Nuceodile at ten times its base weight (60,000 kg) earns $2.07B/s, Toucax at ten times its base weight (120 kg) earns $124M/s.

Every Biohazard Egg pet at a glance

Nuclear Mantis

Nuclear Mantis is an Eternal pet worth $1.5B/s at base size (2,000 kg), $5.4T an hour; #37 of 265 overall. Golden makes it $3.75B/s and Rainbow $5.25B/s. It hatches from the Biohazard Egg. Listed on the wiki Sep 27, 2026, the Dr. Scramble’s Revenge week.

Nuceodile

Nuceodile is a Secret pet worth $500M/s at base size (6,000 kg), $1.8T an hour; #68 of 265 overall. Golden makes it $1.25B/s and Rainbow $1.75B/s. It hatches from the Biohazard Egg. Hatch time 5 mins. Listed on the wiki Sep 27, 2026, the Dr. Scramble’s Revenge week.

Hazardhog

Hazardhog is an Eternal pet worth $500M/s at base size, $1.8T an hour; #70 of 265 overall. Golden makes it $1.25B/s and Rainbow $1.75B/s.

Toucax

Toucax is a Cosmic pet worth $30M/s at base size (12 kg), $108B an hour; #113 of 265 overall. Golden makes it $75M/s and Rainbow $105M/s. It hatches from the Biohazard Egg. Listed on the wiki Sep 27, 2026, the Dr. Scramble’s Revenge week.

Radcoon

Radcoon is a Cosmic pet worth $2.2M/s at base size (25 kg), $7.92B an hour; #152 of 265 overall. Golden makes it $5.5M/s and Rainbow $7.7M/s. It hatches from the Biohazard Egg. Listed on the wiki Sep 27, 2026, the Dr. Scramble’s Revenge week.

Toxic Rat

Toxic Rat is a Mythic pet worth $180K/s at base size (8 kg), $648M an hour; #191 of 265 overall. Golden makes it $450K/s and Rainbow $630K/s. It hatches from the Biohazard Egg. Listed on the wiki Sep 27, 2026, the Dr. Scramble’s Revenge week.

Biohazard Egg pets FAQ

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

What is the Biohazard Egg in Steal An Egg?

The Biohazard Egg is a source outside the zone nests: 6 pets on the wiki come from it. No Speed is needed and the wiki lists no spawn chances.

Can you still get Biohazard Egg pets?

The wiki does not mark which sources are open. Event and special-egg sources come and go with the weekly Saturday updates, so check the updates page for what is live now.

Which Eternal pets are in Biohazard Egg?

2: Nuclear Mantis ($1.5B/s), Hazardhog ($500M/s). Eternal is tier 9 of 13 on the wiki's list.

Which Secret pets are in Biohazard Egg?

One: Nuceodile ($500M/s). Secret is tier 8 of 13 on the wiki's list.

What is the best pet in Biohazard Egg?

Nuclear Mantis, a Eternal pet worth $1.5B/s at base size. Second is Nuceodile at $500M/s, third Hazardhog at $500M/s. Overall Nuclear Mantis is #37 of 265 pets.

How many pets are in Biohazard Egg?

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

When was Biohazard Egg added to Steal An Egg?

The wiki listed its first pets on Sep 27, 2026. No official listing names it, so the wiki date is the closest record.

How much is Nuclear Mantis worth?

Nuclear Mantis earns $1.5B/s at base size (2,000 kg), $5.4T an hour, which puts it #37 of 265 pets overall and #1 of 6 from the Biohazard Egg. Golden takes it to $3.75B/s and Rainbow to $5.25B/s; its page has the value by size.

How much is Nuceodile worth?

Nuceodile earns $500M/s at base size (6,000 kg), $1.8T an hour, which puts it #68 of 265 pets overall and #2 of 6 from the Biohazard Egg. Golden takes it to $1.25B/s and Rainbow to $1.75B/s; its page has the value by size.

How much is Hazardhog worth?

Hazardhog earns $500M/s at base size, $1.8T an hour, which puts it #70 of 265 pets overall and #3 of 6 from the Biohazard Egg. Golden takes it to $1.25B/s and Rainbow to $1.75B/s; its page has the value by size.

What rarity are Biohazard Egg pets?

1 Mythic, 2 Cosmic, 1 Secret, 2 Eternal. Rarity and value line up only loosely here: Nuclear Mantis (Eternal) earns 8,333× as much as Toxic Rat (Mythic). The wiki lists no spawn chances for the source, so rarity is the only odds signal it gives.

What mutations can Biohazard Egg 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 Nuclear Mantis earns $3.75B/s and a Rainbow one $5.25B/s; all multipliers are on the mutations page.

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