A study in newborn chicks shows that brain lateralisation is essential for the development of a left-to-right mental number line.

Lateralization of the brain—the tendency for the left and right hemispheres to specialize in different functions—underlies ...

Like many humans, honeybees seem to prefer their numbers ordered from left to right. Honeybees trained to recognize a specific number tend to fly left when given two side-by-side options of a smaller ...