scholarly journals Do New Caledonian Crows Represent -weight-? An Analysis of Jelbert et al. (2019)

2020 ◽  
Vol 7 (4) ◽  
pp. 661-664
Author(s):  
Ty Henley
Keyword(s):  
New Caledonian Crows

Hook shaping in New Caledonian crows

2003 ◽  
Author(s):  
Alex A. S. Weir ◽  
Jackie Chappell ◽  
Alex Kacelnik
Keyword(s):  
New Caledonian Crows

Selectivity for tool length in New Caledonian crows

2002 ◽  
Author(s):  
Jackie Chappell ◽  
Alex Kacelnik
Keyword(s):  
New Caledonian Crows

Lateralized tool use in wild New Caledonian crows

2004 ◽  
Vol 67 (2) ◽  
pp. 327-332 ◽  
Author(s):  
Robb Rutledge ◽  
Gavin R Hunt
Keyword(s):  
Tool Use ◽  
New Caledonian Crows

New Caledonian crows’ responses to mirrors

2011 ◽  
Vol 82 (5) ◽  
pp. 981-993 ◽  
Author(s):  
F.S. Medina ◽  
A.H. Taylor ◽  
G.R. Hunt ◽  
R.D. Gray
Keyword(s):  
New Caledonian Crows

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 Context-dependent ‘safekeeping’ of foraging tools in New Caledonian crows

2015 ◽  
Vol 282 (1808) ◽  
pp. 20150278 ◽  
Author(s):  
Barbara C. Klump ◽  
Jessica E. M. van der Wal ◽  
James J. H. St Clair ◽  
Christian Rutz
Keyword(s):  
Animal Species ◽  
Crack Open ◽  
Important Constraint ◽  
In The Wild ◽  
New Caledonian Crows ◽  
Context Dependent ◽  
Time And Energy

Several animal species use tools for foraging, such as sticks to extract embedded arthropods and honey, or stones to crack open nuts and eggs. While providing access to nutritious foods, these behaviours may incur significant costs, such as the time and energy spent searching for, manufacturing and transporting tools. These costs can be reduced by re-using tools, keeping them safe when not needed. We experimentally investigated what New Caledonian crows do with their tools between successive prey extractions, and whether they express tool ‘safekeeping’ behaviours more often when the costs (foraging at height), or likelihood (handling of demanding prey), of tool loss are high. Birds generally took care of their tools (84% of 176 prey extractions, nine subjects), either trapping them underfoot (74%) or storing them in holes (26%)—behaviours we also observed in the wild (19 cases, four subjects). Moreover, tool-handling behaviour was context-dependent, with subjects: keeping their tools safe significantly more often when foraging at height; and storing tools significantly more often in holes when extracting more demanding prey (under these conditions, foot-trapping proved challenging). In arboreal environments, safekeeping can prevent costly tool losses, removing a potentially important constraint on the evolution of habitual and complex tool behaviour.

scholarly journals Using the Aesop's Fable Paradigm to Investigate Causal Understanding of Water Displacement by New Caledonian Crows

PLoS ONE ◽  
2014 ◽  
Vol 9 (3) ◽  
pp. e92895 ◽  
Author(s):  
Sarah A. Jelbert ◽  
Alex H. Taylor ◽  
Lucy G. Cheke ◽  
Nicola S. Clayton ◽  
Russell D. Gray
Keyword(s):  
Water Displacement ◽  
Causal Understanding ◽  
New Caledonian Crows

scholarly journals Compound tool construction by New Caledonian crows

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
A. M. P. von Bayern ◽  
S. Danel ◽  
A. M. I. Auersperg ◽  
B. Mioduszewska ◽  
A. Kacelnik
Keyword(s):  
New Caledonian Crows

New Caledonian crows show behavioural flexibility when manufacturing their tools

Behaviour ◽  
2017 ◽  
Vol 154 (1) ◽  
pp. 65-91 ◽  
Author(s):  
Brenna Knaebe ◽  
Alex H. Taylor ◽  
Douglas M. Elliffe ◽  
Russell D. Gray
Keyword(s):  
Behavioural Flexibility ◽  
Tool Manufacture ◽  
In The Wild ◽  
New Caledonian Crows ◽  
Do So

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 these crows respond to different tool-using problems by altering the length of the tools that they manufacture; on average, crows made shorter tools for tasks requiring short tools and longer tools for tasks requiring long tools. They continued to do so when they could not simultaneously see the tool-manufacturing material and the apparatus requiring the use of a tool. Despite altering the length of their tools, the crows frequently did not make tools short or long enough to reliably extract the bait, though this may have been due to shortcomings in the task presented to them. Our results demonstrate that these crows have a degree of behavioural flexibility when making tools, which may be used in the wild during foraging.

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