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Social learning spreads knowledge about dangerous humans among American crows.
Proc Biol Sci. 2012 Feb 07; 279(1728):499-508.PB

Abstract

Individuals face evolutionary trade-offs between the acquisition of costly but accurate information gained firsthand and the use of inexpensive but possibly less reliable social information. American crows (Corvus brachyrhynchos) use both sources of information to learn the facial features of a dangerous person. We exposed wild crows to a novel 'dangerous face' by wearing a unique mask as we trapped, banded and released 7-15 birds at five study sites near Seattle, WA, USA. An immediate scolding response to the dangerous mask after trapping by previously captured crows demonstrates individual learning, while an immediate response by crows that were not captured probably represents conditioning to the trapping scene by the mob of birds that assembled during the capture. Later recognition of dangerous masks by lone crows that were never captured is consistent with horizontal social learning. Independent scolding by young crows, whose parents had conditioned them to scold the dangerous mask, demonstrates vertical social learning. Crows that directly experienced trapping later discriminated among dangerous and neutral masks more precisely than did crows that learned through social means. Learning enabled scolding to double in frequency and spread at least 1.2 km from the place of origin over a 5 year period at one site.

Authors+Show Affiliations

School of Forest Resources, College of the Environment, University of Washington, Seattle, WA 98195, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

21715408

Citation

Cornell, Heather N., et al. "Social Learning Spreads Knowledge About Dangerous Humans Among American Crows." Proceedings. Biological Sciences, vol. 279, no. 1728, 2012, pp. 499-508.
Cornell HN, Marzluff JM, Pecoraro S. Social learning spreads knowledge about dangerous humans among American crows. Proc Biol Sci. 2012;279(1728):499-508.
Cornell, H. N., Marzluff, J. M., & Pecoraro, S. (2012). Social learning spreads knowledge about dangerous humans among American crows. Proceedings. Biological Sciences, 279(1728), 499-508. https://doi.org/10.1098/rspb.2011.0957
Cornell HN, Marzluff JM, Pecoraro S. Social Learning Spreads Knowledge About Dangerous Humans Among American Crows. Proc Biol Sci. 2012 Feb 7;279(1728):499-508. PubMed PMID: 21715408.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Social learning spreads knowledge about dangerous humans among American crows. AU - Cornell,Heather N, AU - Marzluff,John M, AU - Pecoraro,Shannon, Y1 - 2011/06/29/ PY - 2011/7/1/entrez PY - 2011/7/1/pubmed PY - 2012/4/20/medline SP - 499 EP - 508 JF - Proceedings. Biological sciences JO - Proc. Biol. Sci. VL - 279 IS - 1728 N2 - Individuals face evolutionary trade-offs between the acquisition of costly but accurate information gained firsthand and the use of inexpensive but possibly less reliable social information. American crows (Corvus brachyrhynchos) use both sources of information to learn the facial features of a dangerous person. We exposed wild crows to a novel 'dangerous face' by wearing a unique mask as we trapped, banded and released 7-15 birds at five study sites near Seattle, WA, USA. An immediate scolding response to the dangerous mask after trapping by previously captured crows demonstrates individual learning, while an immediate response by crows that were not captured probably represents conditioning to the trapping scene by the mob of birds that assembled during the capture. Later recognition of dangerous masks by lone crows that were never captured is consistent with horizontal social learning. Independent scolding by young crows, whose parents had conditioned them to scold the dangerous mask, demonstrates vertical social learning. Crows that directly experienced trapping later discriminated among dangerous and neutral masks more precisely than did crows that learned through social means. Learning enabled scolding to double in frequency and spread at least 1.2 km from the place of origin over a 5 year period at one site. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/21715408/Social_learning_spreads_knowledge_about_dangerous_humans_among_American_crows_ L2 - https://royalsocietypublishing.org/doi/full/10.1098/rspb.2011.0957?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -