Serra Húnter Associate Professor of Psychobiology of the Department of Experimental Medicine of the University of Lleida (Spain) and member of the «Brain Development and Evolution» Research Group of the Biomedical Research Institute of Lleida (IRBLleida). Her research career focuses on the study of animal behaviour and its biological basis, especially on the relationships between brain, behaviour and evolution.
What do you see in the picture accompanying this article? The answer will probably be: «two dalmatian dogs, sitting and looking at the front». But they are nothing but black spots over a white background.
The first migration led some groups away from the African continent to colonize the rest of the planet and, ever since, geographical displacement of individuals or groups has remained constant throughout history (despite the restrictions currently imposed by border-control policies).