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Crows Are Self-Aware Just Like Humans, And They May Be as Smart as Gorillas
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It could be explained by simply an increasing level of stress in the murder. Stress is transmissible. How would you control for that?
Make it a happy, big, feature rich envirenment, space out the tests, and do "good kidnappins" so that the birds dont think it's too sus
maybe stress out a different group of crows and see how they respond