Selection of tool diameter by New Caledonian crows Corvus moneduloides

2004 ◽  
Vol 7 (2) ◽  
pp. 121-127 ◽  
Author(s):  
Jackie Chappell ◽  
Alex Kacelnik
Keyword(s):  
New Caledonian Crows ◽  
Tool Diameter ◽  
Corvus Moneduloides ◽  
Selection Of

scholarly journals Function and flexibility of object exploration in kea and New Caledonian crows

2017 ◽  
Vol 4 (9) ◽  
pp. 170652 ◽  
Author(s):  
Megan L. Lambert ◽  
Martina Schiestl ◽  
Raoul Schwing ◽  
Alex H. Taylor ◽  
Gyula K. Gajdon ◽  
...  
Keyword(s):  
Control Experiment ◽  
Abstract Concepts ◽  
Before And After ◽  
Novel Objects ◽  
New Caledonian Crows ◽  
Functional Relevance ◽  
Corvus Moneduloides ◽  
Selection Of ◽  
Prior Exploration

A range of non-human animals frequently manipulate and explore objects in their environment, which may enable them to learn about physical properties and potentially form more abstract concepts of properties such as weight and rigidity. Whether animals can apply the information learned during their exploration to solve novel problems, however, and whether they actually change their exploratory behaviour to seek functional information about objects have not been fully explored. We allowed kea ( Nestor notabilis ) and New Caledonian crows ( Corvus moneduloides ) to explore sets of novel objects both before and after encountering a task in which some of the objects could function as tools. Following this, subjects were given test trials in which they could choose among the objects they had explored to solve a tool-use task. Several individuals from both species performed above chance on these test trials, and only did so after exploring the objects, compared with a control experiment with no prior exploration phase. These results suggest that selection of functional tools may be guided by information acquired during exploration. Neither kea nor crows changed the duration or quality of their exploration after learning that the objects had a functional relevance, suggesting that birds do not adjust their behaviour to explicitly seek this information.

scholarly journals Tool use by wild New Caledonian crows Corvus moneduloides at natural foraging sites

2010 ◽  
Vol 277 (1686) ◽  
pp. 1377-1385 ◽  
Author(s):  
Lucas A. Bluff ◽  
Jolyon Troscianko ◽  
Alex A. S. Weir ◽  
Alex Kacelnik ◽  
Christian Rutz
Keyword(s):  
Tool Use ◽  
New Caledonian Crows ◽  
Corvus Moneduloides

scholarly journals On the evolutionary and ontogenetic origins of tool-oriented behaviour in New Caledonian crows (Corvus moneduloides)

2011 ◽  
Vol 102 (4) ◽  
pp. 870-877 ◽  
Author(s):  
BEN KENWARD ◽  
CHRISTIAN SCHLOEGL ◽  
CHRISTIAN RUTZ ◽  
ALEXANDER A. S. WEIR ◽  
THOMAS BUGNYAR ◽  
...  
Keyword(s):  
New Caledonian Crows ◽  
Corvus Moneduloides

scholarly journals Decision-making flexibility in New Caledonian crows, young children and adult humans in a multi-dimensional tool-use task

2019 ◽  
Author(s):  
Rachael Miller ◽  
Romana Gruber ◽  
Anna Frohnwieser ◽  
Martina Schiestl ◽  
Sarah A. Jelbert ◽  
...  
Keyword(s):  
Decision Making ◽  
Tool Use ◽  
Food Item ◽  
Work Effort ◽  
Pongo Abelii ◽  
Adult Humans ◽  
New Caledonian Crows ◽  
Multiple Variables ◽  
Corvus Moneduloides ◽  
Decision Making Tool

AbstractThe ability to make profitable decisions in natural foraging contexts may be influenced by an additional requirement of tool-use, due to increased levels of relational complexity and additional work-effort imposed by tool-use, compared with simply choosing between an immediate and delayed food item. We examined the flexibility for making the most profitable decisions in a multi-dimensional tool-use task, involving different apparatuses, tools and rewards of varying quality, in 3-5-year-old children, adult humans and tool-making New Caledonian crows (Corvus moneduloides). We also compared our results to previous studies on habitually tool-making orangutans (Pongo abelii) and non-tool-making Goffin’s cockatoos (Cacatua goffiniana). Adult humans, cockatoos and crows, though not children and orangutans, did not select a tool when it was not necessary, which was the more profitable choice in this situation. Adult humans, orangutans and cockatoos, though not crows and children, were able to refrain from selecting non-functional tools. By contrast, the birds, though not primates tested, struggled to attend to multiple variables - where two apparatuses, two tools and two reward qualities were presented simultaneously - without extended experience. These findings indicate: (1) in a similar manner to humans and orangutans, New Caledonian crows and Goffin’s cockatoos can flexibly make profitable decisions in some decision-making tool-use tasks, though the birds may struggle when tasks become more complex; (2) children and orangutans may have a bias to use tools in situations where adults and other tool-making species do not.

scholarly journals Cognitive requirements for tool use by New Caledonian crows (Corvus moneduloides)

2007 ◽  
Vol 34 (1) ◽  
pp. 1-7 ◽  
Author(s):  
G. R. Hunt ◽  
C. Lambert ◽  
R. D. Gray
Keyword(s):  
Tool Use ◽  
New Caledonian Crows ◽  
Corvus Moneduloides

scholarly journals Lateralization of tool use in New Caledonian crows ( Corvus moneduloides )

2004 ◽  
Vol 271 (suppl_5) ◽  
Author(s):  
A. A. S. Weir ◽  
B. Kenward ◽  
J. Chappell ◽  
A. Kacelnik
Keyword(s):  
Tool Use ◽  
New Caledonian Crows ◽  
Corvus Moneduloides

Selection of dry drilling parameters for minimal burr size and desired drilling quality

2015 ◽  
Vol 231 (3) ◽  
pp. 480-489 ◽  
Author(s):  
Sona Azarrang ◽  
Hamid Baseri
Keyword(s):  
Removal Rate ◽  
Cutting Speed ◽  
Drilling Process ◽  
Inference System ◽  
Burr Height ◽  
Burr Size ◽  
Drilling Parameters ◽  
Input Parameters ◽  
Tool Diameter ◽  
Selection Of

The drilling of metals produces undesired raised material which is defined as burr. It is important to minimize the burr size by modifying the drill geometry or selection of drilling parameters. Although, selection of optimal drilling parameters can be minimize the burr size, but it may be increases the overcut or decreases the material removal rate (MRR). In this paper, drilling parameters have been selected for minimal burr size and desired overcut and MRR. Four adaptive neuro fuzzy inference system (ANFIS) models have been designed based on experimental observation in drilling of copper. Outputs of ANFIS models are burr height, burr thickness, burr type and overcut of hole; While input parameters of drilling process are cutting speed, tool diameter and ratio of feed rate to diameter. Then the particle swarm optimization method has been used to select the optimum condition of input parameters to minimize the burr size in desired value of overcut and MRR. Results showed that the proposed models can be predict the outputs well and they can be used as adequate predictors and optimizer for achieving the drilling parameters which gives a type of burr with low value of burr height and burr thickness with desirable overcut and MRR.

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