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Animals Count and Use Zero. How Far Does Their Number Sense Go?

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 intelligence of corvids like ravens and crows is well known. Recently, crows were even shown to have a numerical ability seen in few other species so far: a grasp of the concept of the empty set — the numerosity zero.

https://www.quantamagazine.org/animals-can-count-and-use-zero-how-far-does-their-number-sense-go-20210809/?utm_source=pocket-newtab

So, Crows do sit in trees watching humans saying among themselves: "Yip, see that one over there? Just another zero....".