Manufacture and use of hook-tools by New Caledonian crows

@article{Hunt1996ManufactureAU,
  title={Manufacture and use of hook-tools by New Caledonian crows},
  author={Gavin R. Hunt},
  journal={Nature},
  year={1996},
  volume={379},
  pages={249-251}
}
  • G. Hunt
  • Published 18 January 1996
  • Biology
  • Nature
TOOL behaviour in wild birds has been described as mostly stereotyped1,2, and tool manufacture involves little modification of material3–5. Here I report in New Caledonian crows Corvus moneduloides the manufacture and use of two different types of hook tool to aid prey capture: hooked-twig and stepped-cut barbed pandanus leaf. Crow tool manufacture had three features new to tool use in free-living nonhumans: a high degree of standardization, distinctly discrete tool types with definite… 
Hook tool manufacture in New Caledonian crows: behavioural variation and the influence of raw materials
TLDR
It is shown that New Caledonian crows’ manufacture of hooked stick tools can be much more variable than previously thought, and can involve two newly-discovered behaviours: ‘pulling’ for detaching stems and bending of the tool shaft.
The crafting of hook tools by wild New Caledonian crows
  • G. Hunt, R. Gray
  • Biology
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 2004
TLDR
To make all 10 tools, the crows carried out a relatively invariant three–step sequence of complex manipulations that involved (i) the selection of raw material, (ii) trimming and (iii) a lengthy sculpting of the hook.
Species-wide manufacture of stick-type tools by New Caledonian Crows
TLDR
15 additional stick-type tools collected from New Caledonian Crows since the first detailed description of these tools in 1996 are described, indicating that stick- type tools are used widely by Crows and that they are used throughout the year.
Direct observations of pandanus-tool manufacture and use by a New Caledonian crow (Corvus moneduloides)
TLDR
Direct observations of a crow making and using stepped pandanus tools at Pic Ningua verify most of the claims based on the artefact record, but the crow’s exact manufacture technique was slightly different to that inferred previously.
A novel tool-use mode in animals: New Caledonian crows insert tools to transport objects
TLDR
Six observations, in two individuals, of a novel tool-use mode not previously reported in non-human animals, where one subject used a stick to transport an object that was too large to be handled by beak, which suggests the tool facilitated object control.
New Caledonian crows keep ‘valuable’ hooked tools safer than basic non-hooked tools
TLDR
This study is the first to use safekeeping behaviour as a proxy for assessing how non-human animals value different tool types, establishing a novel paradigm for productive cross-taxonomic comparisons.
Selection of tool diameter by New Caledonian crows Corvus moneduloides
TLDR
New Caledonian crows handling of tool diameter is examined, showing that when facing three loose sticks that were usable as tools, they preferred the thinnest one, and that they manufacture a tool of a suitable diameter from a tree branch according to the diameter of the hole through which the tool will be inserted.
New Caledonian crows show behavioural flexibility when manufacturing their tools
New Caledonian crows have demonstrated flexible behaviour when using tools and solving novel problems. However, we do not know whether this flexibility extends to tool manufacture. Here, we show that
The development of pandanus tool manufacture in wild New Caledonian crows
TLDR
The results show that theDevelopment of wide pandanus tool manufacture is a lengthy process comparable to the development of tool use in primates, and exposure to parental tools might help juveniles form a mental template of functional tool design and facilitate the faithful transmission of local design traditions.
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References

SHOWING 1-10 OF 10 REFERENCES
Tool-Making and Tool-Using in the Northern Blue Jay
Laboratory-raised Northeirn blue jays (Cyanocitta cristata) have been observed tearing pieces from pages of newspaper and utilizing them as tools to rake in food pellets which were otherwise out of
A middle stone age worked bone industry from Katanda, Upper Semliki Valley, Zaire.
TLDR
Three archaeological sites at Katanda on the Upper Semliki River in the Western Rift Valley of Zaire have provided evidence for a well-developed bone industry in a Middle Stone Age context, indicating that a complex subsistence specialization had developed in Africa by this time.
Shell Dropping: Decision-Making and Optimal Foraging in Northwestern Crows
TLDR
Decision-making and optimal foraging was investigated in Northwestern crows feeding on whelks (Corvus caurinus) and foraging efficiency was close to the maximum value attainable for crows.
Classification and human evolution
TLDR
A comparison of the Ecology and Behavior of Monkeys and Apes and the Taxonomic Evaluation of Fossil Hominids shows that monkeys and apes have more in common with each other than with other primates.
The Human Revolution
THE HUMAN REVOLUTION* By CHARLES F. HOCKETT and ROBERT ASCHER This essay attempts to set forth the story of the emergence of the first humans from their prehuman ancestors. A special feature is that
Spontaneous tool use and sensorimotor intelligence in Cebus compared with other monkeys and apes
TLDR
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.
Chimpanzee Material Culture: Implications for Human Evolution
TLDR
This paper presents a meta-analyses of chimpanzees as models for ethnology and shows clear patterns of culture in what chimpanzees are, are not, and might be compared to other apes.