Rooks Use Stones to Raise the Water Level to Reach a Floating Worm

@article{Bird2009RooksUS,
  title={Rooks Use Stones to Raise the Water Level to Reach a Floating Worm},
  author={Christopher D. Bird and N. Emery},
  journal={Current Biology},
  year={2009},
  volume={19},
  pages={1410-1414}
}
In Aesop's fable "The Crow and the Pitcher," a thirsty crow uses stones to raise the level of water in a pitcher and quench its thirst. A number of corvids have been found to use tools in the wild, and New Caledonian crows appear to understand the functional properties of tools and solve complex physical problems via causal and analogical reasoning. The rook, another member of the corvid family that does not appear to use tools in the wild, also appears able to solve non-tool-related problems… Expand
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