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Animal researcher Amalia P.M. Bastos led a 2021 study about a wild kea parrot that used small stones as tools to preen its feathers. Skeptical colleagues had initially suggested that the kea’s interactions with the stones might simply be ______, but Bastos and her team showed that the kea was using the stones deliberately.

25 Mar

Animal researcher Amalia P.M. Bastos led a 2021 study about a wild kea parrot that used small stones as tools to preen its feathers. Skeptical colleagues had initially suggested that the kea’s interactions with the stones might simply be ______, but Bastos and her team showed that the kea was using the stones deliberately.

Which choice completes the text with the most logical and precise word or phrase?

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