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Build a Zoo mutations: food, weather and multiplier guide
Last updated: November 5, 2026
A mutation is a stamped bonus on an animal that multiplies the cash per second it pays. Mutations are where the real income in Build a Zoo hides: the strongest published base rate in the game is about $31K/s, and a 12x mutation on a mid table animal beats an unmutated top animal outright. One warning before the tables: two sources publish two different mutation ladders for this game, and they cannot be merged. The first table is the food and weather system one detailed guide documents. The second ladder, from the game's wiki, is shown separately at the bottom with the conflict stated plainly.
Food and weather mutations
Most mutations on this ladder are fed to an animal: give it the named food and the mutation applies. Snow works the other way round, arriving on Snowy eggs during Snowy weather.
| Mutation | Multiplier | Food or trigger | Notes |
|---|---|---|---|
| Gold | 2x | Pear | The entry level food mutation. |
| Diamond | 3x | Pineapple | Produced with a Pineapple. |
| Electric | 5x | Not named in the guide | The guide's table gives the multiplier without naming a food. |
| Fire | 10x | Gold Mango | Produced with a Gold Mango. |
| Jurassic | 12x | Volt Ginkgo | Jurassic eggs need Meteor Heaven, a 1 percent Season Pass spin item. |
| Snow | 12x | Snowy eggs during Snowy weather | Comes from Snowy eggs while Snowy weather is active, rather than from a food. |
Weather mutations
| Mutation | Effect | Notes |
|---|---|---|
| Sandstorm | Adds +2 to an existing mutation multiplier on the animal. | A weather mutation: it strengthens a mutation the animal already carries instead of replacing it. |
Halloween mutations
Pets carrying a Halloween mutation earn 13x, and Halloween mutated eggs cost 72x their base price (Pro Game Guides Halloween event guide). A 13x rate with a 72x egg price is the steepest trade in the game: worth it on a strong animal you plan to keep, painful on anything you would replace within the week.
| Wiki ladder mutation | Multiplier |
|---|---|
| Gold | 1.5x |
| Ruby | 2.5x |
| Emerald | 4x |
| Sapphire | 6.5x |
| Amethyst | 10x |
| Astral | 13x |
The practical advice survives the conflict either way: mutations are multipliers on animals you already own, so they reward hatching strong animals first and mutating second. See the making money fast guide for where mutations sit in the earning order.
How these numbers work
Every animal name in this section is named by at least two public sources, or by a dated event guide whose hatch table a second source reproduces. Sixteen of the 51 animals carry published income figures: the 12 event animals carry exact rates from their event guides, and four core animals carry approximate rates from a single money guide, labelled approximate wherever they appear. The other 35 core animals carry arranged estimates, labelled Estimate wherever they appear: because no source publishes core rarities or a core income ladder, each estimate is built from the game's own structure, with the rarity taken from the animal's conveyor pool or its source egg's place on the published egg price ladder, and the income interpolated inside that rarity band between the published anchors, never above a published figure from a higher band. The moment a source publishes a real rate or rarity for one of these animals, the published figure replaces the estimate. Egg prices and conveyor prices are the figures two source lists agree on; where the two lists disagree, both figures are shown and the disagreement is flagged instead of averaged away. The same rule keeps the two conflicting mutation ladders on the mutations page separate. Codes follow the standard two source rule and every status is dated, because Build a Zoo codes carry redemption caps and can expire mid event.
Checked November 5, 2026. If you spot a figure that disagrees with your game, tell us on the Tell Us board or in our Discord and we will recheck it.
Facts checked on November 5, 2026 against the Build a Zoo wiki on BloxInformer, the TechWiser egg and conveyor guides, Pro Game Guides event, mutation and beginner guides, and the November 2026 code lists named on the codes page. eggvalues.com is a fan site and is not affiliated with Century Farmers or Roblox Corporation. Build a Zoo has no player trading yet, so this section publishes no trade values: rankings use an income index built from the figures on this page.