Crows can count back numbers through vocalisations (infographic)

Crows can recognise and count back numbers through their vocalisations like 3-year-old kids

This test by Dr Diana Liao confirms yet again that the crow is one of nature’s smartest creatures. The crow can look at a number such as the numeral 4 and confirm to researchers that they recognise the number by making their typical vocalisation, the caw, four times. They were imperfect however which indicated …

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