Soru

While many avian species exhibit basic problem-solving abilities, the New Caledonian crow stands out for its sophisticated tool manufacture and usage. In the wild, these crows do not simply search for pre-existing objects to use as tools; rather, they deliberately construct them from raw materials. For instance, they fashion hooks from thin, barbed twigs to extract wood-boring larvae from deep tree crevices. They also shape tools from the stiff, serrated leaves of the pandanus plant, cutting them into precise tapered strips. Laboratory observations confirm that these birds can even bend wire into hooks to retrieve food baskets from vertical tubes. While some researchers once believed that these crows merely copied simple behaviors from their parents, extensive field studies have shown that young crows undergo a prolonged learning period to master the complex geometry of leaf-tool construction. This remarkable behavior demonstrates a level of cognitive complexity previously associated almost exclusively with primates, suggesting that complex tool manufacture and use can evolve independently in species outside the mammalian lineage.

Which statement best summarizes the primary argument presented in the passage?