Chicken Nest

Eats pests and adds +1 harvest to crops.

Pecks around its nest, and every 6th time picks a planted crop within 10 tiles (20 for one of them) that hasn't had one yet and adds +1 to its harvests: the crop grows back once more. Then it rests at its nest for about a minute. A crop gets one at most.

Every nest shares one price: each one built makes the next cost more.