In the animal world, you don't need to learn a numeral system – such as the ten-digit Indo-Arabic system we commonly use – to be able to count. Animals constantly use numerical information from their environment to make decisions. Estimating the number of conspecifics in a competing group before engaging in conflict, the amount of food available in a difficult-to-reach location, or the number of potential sexual partners in a new territory is essential for survival and reproduction. This skill can reach an astonishing level of refinement; for example, certain species of ants orient themselves in the desert by estimating the number of steps required to reach a target.

https://www.miragenews.com/fruit-flies-can-differentiate-between-numerical-1047339/

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