 This study examined how early environmental complexity affects the spatial skills of laying hen pullets. The results showed that white feathered birds performed better than brown feathered birds in all tests, regardless of their rearing environment. Additionally, white feathered birds from the high complexity group performed better than white feathered birds from the mid and low groups. Furthermore, white feathered birds preferred to use a ramp to move downwards, but only if they had previously experienced it, and if the ramp was not too steep. These findings suggest that early environmental complexity may have a greater impact on white feathered birds than brown feathered birds. This article was authored by Anna K. Wrench, Erin Ross, Alexandra Harlander, and others.