Visual lateralisation in quails (Coturnix coturnix).

Two-week-old quails (Coturnix coturnix) were trained to discriminate food grains scattered randomly on a background of small pebbles of similar size adhering to the floor and differing from the grains in texture and hue ("pebble floor task"). Quails tested binocularly or with only their right eye in use showed less pecking to the pebbles and more pecking to the grains than quails tested with only their left eye in use. Adult quails in contrast did not show lateralisation. These findings add to previous evidence for visual lateralisation in birds in the pebble floor task suggesting that neural structures fed by the right eye, mainly located to the left hemisphere, are better suited to rapid visual categorisation of food objects. Like other galliformes species such as the domestic chick (Gallus gallus), but unlike non-galliformes species such as the pigeon, behavioural lateralisation in the pebble floor task may be associated with transitory anatomical asymmetries in the thalamofugal visual pathway.