Shaping of Hooks in New Caledonian Crows

  title={Shaping of Hooks in New Caledonian Crows},
  author={Alex A. S. Weir and Jackie Chappell and Alex Kacelnik},
  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 
Tool bending in New Caledonian crows
Field experiments have revealed that tool bending is part of the New Caledonian crow species' natural behavioural repertoire, providing important context for interpreting Betty's iconic wire-bending feat.
Behavioural ecology: Tool manufacture by naive juvenile crows
It is shown that hand-raised juvenile New Caledonian crows spontaneously manufacture and use tools, without any contact with adults of their species or any prior demonstration by humans.
Lateralization of tool use in New Caledonian crows (Corvus moneduloides)
Results contrast with observations that the crows have a population–level bias for manufacturing tools from the left edges of Pandanus sp.
Tool manufacture by New Caledonian crows : chipping away at human uniqueness
This work identifies ten complex aspects that occur in New Caledonian crows' toolmaking, which is more similar to human toolmaking than that of any other nonhuman species, including chimpanzees.
Tool-use and tool-manufacture are thought to require high cognitive skills and have been considered as an exclusive attribute to primates. Recent observations of New Caledonian crows (NCCs) challen
New Caledonian crows attend to multiple functional properties of complex tools
The extent to which normally co-occurring tool features inform tool-orientation decisions is explored, by forcing birds to deploy ‘unnatural’ tools, which exhibited these traits at opposite ends.
Morphology and sexual dimorphism of the New Caledonian crow Corvus moneduloides, with notes on its behaviour and ecology
Measurements showed that the New Caledonian Crows were sexually dimorphic in size (the males were larger but not in shape), and it was found that the crows lived in mixed-sex groups, which supports the hypothesis that these may be family groups.
Do wild New Caledonian crows (Corvus moneduloides) attend to the functional properties of their tools?
New Caledonian crows are the most proficient non-hominin tool manufacturers but the cognition behind their remarkable skills remains largely unknown, and it is indicated that the crows do not consistently attend to the presence or orientation of barbs on pandanus tools.
Is primate tool use special? Chimpanzee and New Caledonian crow compared
  • W. McGrew
  • Biology
    Philosophical Transactions of the Royal Society B: Biological Sciences
  • 2013
The chimpanzee (Pan troglodytes) is well-known in both nature and captivity as an impressive maker and user of tools, but recently the New Caledonian crow (Corvus moneduloides) has been championed as
The social structure of New Caledonian crows


Tool selectivity in a non-primate, the New Caledonian crow (Corvus moneduloides)
An experiment is presented showing that New Caledonian crows are able to choose tools of the appropriate size for a novel task, without trial-and-error learning.
Human–like, population–level specialization in the manufacture of pandanus tools by New Caledonian crows Corvus moneduloides
  • G. Hunt
  • Biology
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 2000
New evidence of human-like specialization in crows' manufacture of hook tools from pandanus leaves is found: functional lateralization or ‘handedness’ and the shaping of these tools to a rule system, the first demonstration that a population bias for handedness in tool-making and the shape of tools to rule systems are not concomitant with symbolic thought and language.
Manufacture and use of hook-tools by New Caledonian crows
New Caledonian crows Corvus moneduloides are reported on the manufacture and use of two different types of hook tool to aid prey capture: hooked-twig and stepped-cut barbed pandanus leaf.
Spontaneous tool use and sensorimotor intelligence in Cebus compared with other monkeys and apes
Spontaneous tool use and sensorimotor intelligence in Cebus were observed to determine whether tool use is discovered fortuitously and learned by trial-and-error or, rather, whether advanced sensorsimotor abilities are critical in its ontogeny and evolution.
Success and Understanding in Cognitive Tasks: A Comparison Between Cebus apella and Pan troglodytes
If the authors consider the ways in which children experience or achieve initial success and then become fully proficient in solving similar tasks, they can appreciate the different recipes for success that Pan and Cebus present.
The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots
This chapter discusses how to teach a Parrot a Human-based Communication Code, and the implications of Alex's data.
Solutions to a tool-use problem in a pair of Cebus apella
L'utilisation d'outils chez un couple de singes capucins adultes (Cebus apella) utilisent des bâtons qu'ils introduisent dans les trous perces sur le couvercle d'une boite pour recuperer le miel qu'elle contient, choisissant l'outil approprie parmi des bîtons de differents diametres.
Folk Physics for Apes
Int. J. Primatol
  • Int. J. Primatol
  • 1997
Anim. Cogn
  • Anim. Cogn
  • 2002