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@freemo

Well, it seems really hard to design an experiment to know if animals have abstraction capabilities.

I think they must have some; knowing if a random animal belongs to your species or not is in itself a form of abstraction.

Creating symbols and managing them is really what language is about; and math is the most formalized and strict of them. Since animals have very limited language abilities, it is not surprising their math abilities are (nearly?) undetectable.