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Crows Can Count Out Loud: How Do Other Animals Count?

Humans are quite advanced when it comes to using numerical numbers. We can count in our heads and out loud: 1, 2, 3, 4. But ...
NPR

Crows can count out loud like human toddlers — when they aren't cheating the test

Math isn't just a human thing. All kinds of animals, from African grey parrots to chimpanzees, are thought to have some kind of mathematical ability, but it can be hard to test. Now, a new study finds ...