Shaping of Hooks in New Caledonian Crows

@article{Weir2002ShapingOH,
  title={Shaping of Hooks in New Caledonian Crows},
  author={Alex A. S. Weir and Jackie Chappell and Alex Kacelnik},
  journal={Science},
  year={2002},
  volume={297},
  pages={981 - 981}
}
Many animals use tools, but their understanding of physical forces or causal relations is unclear ([1][1], [2][2]). Primates are considered the most versatile and complex tool users, but observations of New Caledonian crows ( Corvus moneduloides ) ([3–5][3]) raise the possibility that these birds 
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  • 2013
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