Figure 2. Means (+ s.e.m.) pecks at grains made by Di-chicks (top), EarlyLi-chicks (middle) and LateLi-chicks (bottom) at the cancellation grid toward left (L) and right (R) from the central midline (C) in 3 minutes of activity.

Lighter parts indicate the greater amount of pecks toward left. Single grains of food and the chick's head viewed from above are superimposed in post-editing to the graph for representational purposes only.