Roostr is the second NFT to launch in the chikn eggosystem. Roostr squirts $fert and requires one $egg a day to continue laying $fert. Roostr can be upgraded with $egg and with each upgrade the Roostr squirts an additional two $fert.
The first utility of $fert is to fertilize #farmland so you can increase LP yield. However, this is only the beginning of it's utility and more is on the road map.
Roostr will be used in battles and breeding so they will continue to play an increasingly important roll in the eggosystem.
For more details about what roostr means to the eggosystem are in this medium article: