The larger shall be on the right side. Domestic chicks are better at identifying larger sets when these are located to their right side
Preliminary investigation of the representation of visual proportions in 4-day-old domestic chicks (Gallus gallus)
Left-right asymmetries in spatial numerical processing. Behavioural evidence from an animal model: the domestic chick (Gallus gallus)
One, two, three, four, something more? Proto-numerical discrimination in day old domestic chicks (Gallus gallus)