New Caledonian crows reason about hidden causal agents

We have generally believed that animals are not capable of very complex thought, even though many species use tools and engage in other complex behaviors.

Even a bird brain appears to be capable of understanding things that are not visible may be affecting their environment.

This study looks at whether New Caledonian crows, that were caught just for this experiment, are capable of attributing actions to a hidden cause, when they see that possible cause come and go.

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