nEngine/examples/sample-game/content/animals/chicken.yaml

# Chicken: chick -> grown -> laying. Feed is required from grown onward;
# a mature (final-stage) chicken emits animal-produce each fed day. Stages
# reference procedural sprites (content/sprites/).
id: chicken
stages:
  - { name: chick, days: 2, feedRequired: false, spriteRef: chicken-chick }
  - { name: grown, days: 2, feedRequired: true, spriteRef: chicken-grown }
  - { name: laying, days: 1, feedRequired: true, spriteRef: chicken-laying }
produces:
  - { itemId: egg, qty: 1 }