Animal Index

Introduction

The Animal Index is the built-in collection encyclopedia of Bike For Egg!. Every pet you hatch is recorded in it, and each page of the Index lists the pets the game expects you to collect — including rarer sizes and mutations. Complete every listed pet on a page and the game lets you claim a reward, because the official description promises claimable rewards for the Index. The same collection milestones feed the badge system: the official roster counts WELCOME!, Hatched Divine!, Hatched Secret!, Hatched Eternal! and Demon Treadmill! as its five confirmed badges. This page explains how the Index works, how to complete pages efficiently, what rewards to claim and how the badges tie your collection goals together.

Rewards & Badge Milestones

Index & Badges

Core Mechanics

Every pet you hatch is automatically recorded in the Animal Index, so the encyclopedia grows with your actual hatching history rather than a separate checklist. Each Index page holds a group of pets, and to complete the page you need to obtain every pet listed there — including rarer sizes and mutations, which adds a collection layer beyond just seeing base forms. When a page is complete, the official description says rewards are claimable, so the system converts casual collection into a goal structure. The badges form a parallel ladder: WELCOME! is the community entry badge, the three hatching badges prove you pulled Divine, Secret and Eternal pets, and Demon Treadmill! proves you reached the top treadmill tier. Collectively they give completionists two connected progress tracks — the Index pages and the badge set — that overlap but are not identical.

Advantages

Tracking the Animal Index turns every hatch into progress toward a concrete goal. Instead of hatching aimlessly, you can always look at which pages are incomplete and target the pets they need — including variants like mutations and sizes that many players ignore. The reward claim system gives an immediate payback for page completion, making collection genuinely worth the grind. The badge ladder adds prestige targets that check your luck and persistence simultaneously: the hatching badges prove you pulled the top rarities, while Demon Treadmill! proves you finished the treadmill chain. Because the Index overlaps with mutation and size hunting, a single good hatch session can progress multiple collection lines at once. For completionists the Index is also the clearest definition of "done" the game offers.

Challenges

The exact rewards for completing Animal Index pages are not listed in official public text, so the wiki describes them as claimable rewards without inventing specific amounts. The complete Index contents are not published either, so page lists are reconstructed from hatching experience and may be incomplete when new pets arrive. Because variants like sizes and mutations count toward page completion, the collection can take far longer than the base pet list suggests — you may own every base pet and still be missing a rarer size. Update patches can add new Index pages without notice, resetting the "complete" feeling for completionists. We keep the page updated from the latest community testing.

Frequently Asked Questions

Quick Tips