# Architecture

Everyone knows that chikn lay $EGG, and Roostr squirt $FERT. The need to rhyme is stronger than we are.

Roostr produce the all-important $FERT—a token that can be used to improve FarmLand reward yields among other things. For more information on what $FERT can be used for, see the section on[ $FERT](https://docs.chikn.farm/tokens/fert).

To produce $FERT, Roostr need to eat $EGG. These protein-rich ovals pass through the Roostr’s digestive system, helping them grow bigger and coming out the other end as $FERT.

<figure><img src="https://3677132957-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FF8OuqlG4SiJ3bLJ9JiW1%2Fuploads%2FoIMHXKk28rQdT8mNSq18%2F1%20O5vwzjO1a9Md8KZI72PB2g.gif?alt=media&#x26;token=f2e55b6d-7f2d-43bb-9ac1-5303cb4292b9" alt=""><figcaption><p>The $FERT Cycle - animation by <a href="https://twitter.com/thelinhhoang">linsanity</a></p></figcaption></figure>

Roostr bring added complexity to the Chikn game and give players the opportunity to optimize their Farming strategies. With the rollout of Foraging introducing new ways to spend $FERT, Roostr themselves have become even more important in the broader meta.