title: Do new caledonian crows solve physical problems through causal reasoning?
abstract: The extent to which animals other than humans can reason about physical problems is contentious. The benchmark test for this ability has been the trap-tube task. We presented New Caledonian crows with a series of two-trap versions of this problem. Three out of six crows solved the initial trap-tube. These crows continued to avoid the trap when the arbitrary features that had previously been associated with successful performances were removed. However, they did not avoid the trap when a hole and a functional trap were in the tube. In contrast to a recent primate study, the three crows then solved a causally equivalent but visually distinct problem--the trap-table task. The performance of the three crows across the four transfers made explanations based on chance, associative learning, visual and tactile generalization, and previous dispositions unlikely. Our findings suggest that New Caledonian crows can solve complex physical problems by reasoning both causally and analogically about causal relations. Causal and analogical reasoning may form the basis of the New Caledonian crow's exceptional tool skills.
authors.affiliation: Department of Psychology, University of Auckland, Private Bag 92019, Auckland, New Zealand. alexhtaylor@gmail.com
authors.forename: A H
authors.initials: AH
authors.lastname: Taylor
authors.forename: G R
authors.initials: GR
authors.lastname: Hunt
authors.forename: F S
authors.initials: FS
authors.lastname: Medina
authors.forename: R D
authors.initials: RD
authors.lastname: Gray
mesh_terms: D000818:Animals; D003071:Cognition; D046368:Crows / Q000502:physiology*; D005260:Female; D008297:Male; D011340:Problem Solving / Q000502:physiology*; D053001:Tool Use Behavior
references.citation: Annu Rev Psychol. 2007;58:97-118
references.pmid: 17029564
references.citation: J Exp Psychol Anim Behav Process. 2003 Jul;29(3):233-42
references.pmid: 12884682
references.citation: Behav Brain Sci. 2008 Apr;31(2):109-30; discussion 130-178
references.pmid: 18479531
references.citation: J Comp Psychol. 1995 Mar;109(1):18-26
references.pmid: 7705056
references.citation: Proc Natl Acad Sci U S A. 2006 May 2;103(18):7181-5
references.pmid: 16641097
references.citation: Anim Cogn. 2005 Jan;8(1):60-6
references.pmid: 15322943
references.citation: J Comp Psychol. 1994 Mar;108(1):15-22
references.pmid: 8174341
references.citation: Cognition. 1997 Sep;64(3):285-308
references.pmid: 9426504
references.citation: Curr Biol. 2006 Apr 4;16(7):697-701
references.pmid: 16581516
references.citation: Anim Behav. 1999 Mar;57(3):565-582
references.pmid: 10196046
references.citation: Anim Behav. 1998 Jul;56(1):256-9
references.pmid: 9710485
references.citation: Curr Biol. 2007 Sep 4;17(17):1504-7
references.pmid: 17702575
references.citation: Behav Processes. 1998 Feb;42(2-3):189-203
references.pmid: 24897462
references.citation: Anim Cogn. 2006 Apr;9(2):94-109
references.pmid: 16341524
references.citation: J Comp Psychol. 2008 May;122(2):156-66
references.pmid: 18489231
references.citation: Anim Cogn. 2008 Jul;11(3):423-30
references.pmid: 18183433
references.citation: Learn Behav. 2005 Feb;33(1):47-58
references.pmid: 15971492
references.citation: J Comp Psychol. 2004 Jun;118(2):232-41
references.pmid: 15250810
references.citation: J Comp Psychol. 2001 Mar;115(1):106-10
references.pmid: 11334213
references.citation: Mem Cognit. 1999 Sep;27(5):779-90
references.pmid: 10540807
references.citation: Science. 2006 Feb 17;311(5763):1020-2
references.pmid: 16484500
references.citation: Cognition. 1990 Apr;35(1):69-95
references.pmid: 2340713
references.citation: J Exp Psychol Anim Behav Process. 2008 Jan;34(1):54-62
references.pmid: 18248114
references.citation: Science. 2002 Aug 9;297(5583):981
references.pmid: 12169726
references.citation: Anim Cogn. 2006 Oct;9(4):317-34
references.pmid: 17024509
references.citation: Science. 1987 Sep 11;237(4820):1317-23
references.pmid: 3629243
references.citation: Anim Cogn. 2006 Jul;9(3):193-9
references.pmid: 16612632
references.citation: Proc Biol Sci. 2000 Feb 22;267(1441):403-13
references.pmid: 10722223
references.citation: Proc Biol Sci. 2004 Feb 7;271 Suppl 3:S88-90
references.pmid: 15101428