{"fact":"Rooks, a type of crow, have demonstrated insightful problem-solving by spontaneously bending wire to create a hook tool to retrieve food, despite not being known to use tools in the wild.","context":"Three out of four subjects were successful on their first trial and the fourth subject was successful on the fourth trial…The fact that the rooks created a tool (hook) from a novel material (wire) on the first trial on which it was presented, when they do not use tools in the wild and with only limited experience of a functionally similar, but not perceptually similar, hook tool, provides a reasonable case for insight.","source":"Nathan J. Emery, Insight, imagination and invention: Tool understanding in a non-tool-using corvid, 10.1017/cbo9780511894800.006","index":448}