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

# Cow: calf -> grown -> milking. Feed is required from grown onward; a mature
# (milking-stage) cow emits animal-produce each fed day, which the cow-milk
# state machine turns into milk. Stages reference procedural sprites.
id: cow
stages:
  - { name: calf, days: 3, feedRequired: false, spriteRef: cow-calf }
  - { name: grown, days: 3, feedRequired: true, spriteRef: cow-grown }
  - { name: milking, days: 1, feedRequired: true, spriteRef: cow-milking }
produces:
  - { itemId: milk, qty: 1 }