Lessons of Nature: Do Teachers and Pupils Exist in the Animal Kingdom?

Scientists used to think animals learned by imitation and that teaching was an exclusively human occupation. Now though, experiments with crows, ants and meerkats are proving otherwise.

Some urban crows in Japan have learned how to crack nuts in a unique way. They drop the nut from a great height onto a busy road, let the passing cars crush it, and when the light turns green they swoop down onto the road and peck at the contents. The first crow that started this shtick probably did it by chance, and others followed and upgraded the technique. They did it by trial and error

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