From Martin Pitt, Leeds, UK
The gains from flitting between foraged food sources may not have promoted what we call ADHD. Instead, look at birds feeding on the ground. They don’t hang around to pick up the food for a long time, but make frequent, random movements away to different places. This makes it harder for a stealthy predator to pounce accurately. A hominid carefully picking all the berries in a bush would be in danger (2 March, p 9).
