Chickens

Chickens
Animals serve as a source of money and resources on your farm. They can typically be obtained only after a building is constructed on the farm that is suitable to house them (a coop for chickens, for example) and with the exception of the horse and the pet, must either be purchased from Marnie's Ranch or hatched from an Incubator. In either case, these animals arrive as babies and must grow into adults before they begin producing animal products. stardew valley wiki
Chickens