Researchers trained 8 crows to use a vending machine, then removed the model they had been copying; 6 of 8 succeeded, suggesting crows can rely on memory alone

Wild crows demonstrated remarkable memory by recreating tool sizes without visual cues. These birds operated a special vending machine, learning to produce specific paper piece dimensions. After the visual template was removed, six out of eight crows still made the correct size. This suggests crows form mental images and reconstruct tools using their own techniques. Such findings challenge traditional views on how tool-making skills are passed down through generations.