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R. Soc. B."],"published-print":{"date-parts":[[2019,1,16]]},"abstract":"<jats:p>Humans use a variety of cues to infer an object's weight, including how easily objects can be moved. For example, if we observe an object being blown down the street by the wind, we can infer that it is light. Here, we tested whether New Caledonian crows make this type of inference. After training that only one type of object (either light or heavy) was rewarded when dropped into a food dispenser, birds observed pairs of novel objects (one light and one heavy) suspended from strings in front of an electric fan. The fan was either on\u2014creating a breeze which buffeted the light, but not the heavy, object\u2014or off, leaving both objects stationary. In subsequent test trials, birds could drop one, or both, of the novel objects into the food dispenser. Despite having no opportunity to handle these objects prior to testing, birds touched the correct object (light or heavy) first in 73% of experimental trials, and were at chance in control trials. Our results suggest that birds used pre-existing knowledge about the behaviour exhibited by differently weighted objects in the wind to infer their weight, using this information to guide their choices.<\/jats:p>","DOI":"10.1098\/rspb.2018.2332","type":"journal-article","created":{"date-parts":[[2019,1,9]],"date-time":"2019-01-09T08:08:12Z","timestamp":1547021292000},"page":"20182332","update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":24,"title":["New Caledonian crows infer the weight of objects from observing their movements in a breeze"],"prefix":"10.1098","volume":"286","author":[{"given":"Sarah A.","family":"Jelbert","sequence":"first","affiliation":[{"name":"Department of Psychology, University of Cambridge, Cambridge, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2996-9571","authenticated-orcid":true,"given":"Rachael","family":"Miller","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Cambridge, Cambridge, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martina","family":"Schiestl","sequence":"additional","affiliation":[{"name":"School of Psychology, University of Auckland, Auckland, New Zealand"},{"name":"Max Planck Institute for the Science of Human History, Max Planck Society, Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0738-2764","authenticated-orcid":true,"given":"Markus","family":"Boeckle","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Cambridge, Cambridge, UK"},{"name":"Department of Psychotherapy, Bertha von Suttner University, St P\u00f6lten, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucy G.","family":"Cheke","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Cambridge, Cambridge, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Russell D.","family":"Gray","sequence":"additional","affiliation":[{"name":"School of Psychology, University of Auckland, Auckland, New Zealand"},{"name":"Max Planck Institute for the Science of Human History, Max Planck Society, Jena, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alex H.","family":"Taylor","sequence":"additional","affiliation":[{"name":"School of Psychology, University of Auckland, Auckland, New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1835-423X","authenticated-orcid":true,"given":"Nicola S.","family":"Clayton","sequence":"additional","affiliation":[{"name":"Department of Psychology, University of Cambridge, Cambridge, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2019,1,9]]},"reference":[{"key":"e_1_3_7_2_2","doi-asserted-by":"publisher","DOI":"10.2307\/1130030"},{"key":"e_1_3_7_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00426-005-0032-4"},{"key":"e_1_3_7_4_2","doi-asserted-by":"publisher","DOI":"10.1037\/0096-1523.7.4.733"},{"key":"e_1_3_7_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00221-013-3554-9"},{"key":"e_1_3_7_6_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.0272-4332.2004.00433.x"},{"key":"e_1_3_7_7_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0009709"},{"key":"e_1_3_7_8_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00426-011-0398-4"},{"key":"e_1_3_7_9_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1467-8624.2012.01824.x"},{"key":"e_1_3_7_10_2","doi-asserted-by":"crossref","unstructured":"Povinelli D. 2012 World without weight: perspectives on an alien mind . 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