Animals can count and use zero

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It turns out that being able to count from zero is not a uniquely human skill. Among all animals, only monkeys, honeybees, and more recently, crows have been found to recognize the number zero ー a concept that very young children have trouble understanding. But how are we so sure? They were observed to confuse an empty set of objects with a set containing only one object more frequently than the a set containing two objects, suggesting that the animals likely think zero as next to one on the number line.
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