How to Get the Probe Rooster
What this page helps you decide: which egg to hatch for the Probe Rooster, and how many hatches to budget before it shows up
The Probe Rooster is a Common chicken, tier 1 of 10 on the rarity ladder that appears in the drop data. One egg can hatch it, and the best published rate is 25% from the Void Egg — about 4 hatches before you should expect to see one. Below: every route in with the expected hatches worked out, where it sits among the 9 outcomes of that egg, how it compares with the other Common chickens, and what we found when we checked the published percentages.
Only one way in
Nothing else in the current drop data produces the Probe Rooster. That makes the Void Egg a single gate: at 25% you should expect around 4 hatches before it appears, and farming any other egg does not shorten that number. The Void Egg itself is laid by the Astro Chick, so one of those on the plot is the entire supply chain — there is no second source to fall back on if you stop keeping it.
Where it sits inside the Void Egg
The Void Egg can hatch 9 different chickens. The Probe Rooster is the 1st most likely of them, with 8 outcomes sitting below it on the table. At that position it turns up often enough that a dedicated farm is usually wasted effort — it arrives while you are chasing the rarer drops in the same egg.
Against the other Common chickens
There are 12 Common chickens in the current drop data. Ranked by best available rate, 1 of them is easier to obtain than the Probe Rooster and 10 are harder. Rarity labels are not difficulty labels: two chickens carrying the same tag can sit an order of magnitude apart in expected hatches.
What the published table does not say
These rates come from a single community index rather than the game files, so we checked the arithmetic before using them. 9 of the 17 egg tables do not add up to 100 percent — across the set they run from 91 to 102 percent. The Void Egg table is one of those, summing to 91 percent, so treat 25% as a rounded figure rather than an exact one. Rounded rates are good enough for deciding which egg to farm. They are not good enough for predicting any single hatch, and anywhere a rate is written as "under 1%" the true value could be several times smaller than the estimate above.
Step-by-Step
- Keep an Astro Chick on your plot — it lays the Void Egg, which is the source you can actually control.
- Hatch it repeatedly and budget around 4 hatches at the published 25%.
- Do not spend sessions on other eggs hoping for it; nothing else in the data drops the Probe Rooster.
- Treat it as a by-product: farm the Void Egg for its rarer outcomes and this one will arrive on the way.
Data Tables
| Egg | Published rate | Expected hatches | How you get that egg | Source table sums to |
|---|---|---|---|---|
| Void Egg | 25% | 4 | Laid by the Astro Chick | 91% |
FAQ
How do you get the Probe Rooster in Grow a Chicken Fighter?
Hatch the Void Egg. It drops the Probe Rooster at 25%, which works out to roughly 4 hatches before you should expect one.
What rarity is the Probe Rooster?
Common, which is tier 1 of the 10 rarity steps that appear in the drop data.
Is the Probe Rooster worth farming for?
Not on its own. It is the 1st most likely outcome of the Void Egg, so it arrives while you farm that egg for something rarer.
Sources
- Community Grow a Chicken Fighter Eggs Index (community drop table) — Single community source for every drop rate on this page. Captured 2026-08-27. We recomputed each table: 9 of 17 do not sum to 100%, so the rates are treated as rounded throughout.