Crows recently demonstrated an understanding of the concept of zero. It’s only the latest evidence of animals’ talents for numerical abstraction — which may still differ from our own grasp of numbers.

While some experiments try to test animals' perception of quantities in natural settings, others use training paradigms that offer experimenters more control over the conditions. All face the obstacle ...

The results of a new canine numerosity study suggests that a common neural mechanism has been deeply conserved across mammalian evolution. Dogs spontaneously process basic numerical quantities, using ...