Cosmic Gorilla in Steal an Egg

The Cosmic Gorilla Egg is the Mythic-rarity egg of the Cosmic, and the pet inside it is Cosmic Gorilla. Cosmic is zone 9 of 12 on the wiki's Biomes list; the wiki lists its entry requirement as 700M speed, and the nests there are watched by the Cosmic Skeleton.

Base income is $180K/s. Among the 8 pets tagged Cosmic on the wiki that puts Cosmic Gorilla at number 6 — Unicorn tops the Cosmic at $1B/s. Remember the game multiplies this base by the size roll and by the mutation, so two Cosmic Gorillas can earn very different amounts.

With a colour mutation and no size bonus, the same Cosmic Gorilla would earn roughly: Silver ×1.2 ≈ $216K/s, Golden ×2.5 ≈ $450K/s, Rainbow ×3.5 ≈ $630K/s (multipliers from the wiki's Mutations page; arithmetic is ours). Add a Giant (×3) or Huge (×5) size roll on top and the numbers multiply again.

Hatching it pays a one-off reward of +1.2m Speed, $18m, and the egg takes 7m to grow in the pen. That reward is the reason low-income eggs are still worth stealing early: the speed bonus is what gets you into the next zone.

Mythics are the eggs other players come to steal. Bear traps around the pen are the cheap insurance (max 3, 7-second hold).