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CrowdScience - How do you identify an optimistic crow? - BBC Sounds

From: CrowdScience

How do you identify an optimistic crow?How do you identify an optimistic crow?

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Do crows enjoy solving puzzles? Biologist Cody McCoy devised an experiment to find out

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CrowdScience
How do you identify an optimistic crow?
Do crows enjoy solving puzzles? Biologist Cody McCoy devised an experiment to find out
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