摘要
In Guillette and Healy(2019),these erroneous texts should be excluded on:Page 205,left column.The text“and are the only non-human species known to craft hooks.Based on a small number of observations,their manufacture of hooked stick tools has previously been described as a complex,multi-stage process.Tool behavior is shaped by genetic predispositions,individual and social learning,and/or ecological influences,but disentangling the relative contributions of these factors remains a major research challenge.The properties of raw materials are an obvious,but largely overlooked,source of variation in tool-manufacture behavior.We conducted experiments with wild-caught New Caledonian crows to assess variation in their hooked stick tool making,and to investigate how raw-material properties affect the manufacture process.Results:In Experiment 1,we showed that New Caledonian crowsu2019 manufacture of hooked stick tools can be much more variable than previously thought(85 tools by 18 subjects)”should be removed.
