Humans, including infants, and many other species have a capacity for rapid, nonverbal estimation of numerosity. However, the mechanisms for number perception are still not clear; some maintain that ...

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.

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 ...