Such rare bird that has been extinct in the wild, has reached an elite intelligent animal; Hawaiian Crow, of course, use tools to get the food.
The bird includes now only one other corvids - New Caledonia - Crow niche in this exclusive development.
Dr Christian Rutz St. Andrews of the University, described his realization that the bird can be a tool for the discovery of the user as a "teachable moment". He and his international team of colleagues have published their discovery in the journal Nature .
Images courtesy of Crow San Diego Zoo and World University St. Andrews
Video produced by Victoria Gill
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