Spatial cognition in vertebrates is adversely affected by a lack of environmental complexity during early life. However. to our knowledge no previous studies have tested the effect of early exposure to varying degrees of environmental complexity on specific components of spatial cognition in chickens. There are two main rearing systems for laying hens in the EU: aviaries and cages. https://www.roneverhart.com/Necco-Halloween-Snack-Size-Candy-Buttons-Strips-Wrapped-32-Piece-Bag/