Now showing items 1-7 of 7

    • Context-dependent 'safekeeping' of foraging tools in New Caledonian crows 

      Klump, Barbara Christina; van der Wal, Jessica Eva Megan; St Clair, James; Rutz, Christian (2015-05-20) - Journal article
      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 ...
    • Function and flexibility of object exploration in kea and new caledonian crows 

      Lambert, Megan L.; Schiestl, Martina; Schwing, Raoul; Taylor, Alex H.; Gajdon, Gyula K.; Slocombe, Katie E.; Seed, Amanda M. (2017-09-27) - Journal article
      A range of non-human animals frequently manipulate and explore objects in their environment, which may enable them to learn about physical properties and potentially form more abstract concepts of properties such as weight ...
    • Hook tool manufacture in New Caledonian crows : behavioural variation and the influence of raw materials 

      Klump, Barbara Christina; Sugasawa, Shoko; St Clair, James; Rutz, Christian (2015-11-18) - Journal article
      Background: New Caledonian crows use a range of foraging tools, 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 ...
    • Preliminary observations of tool-processing behaviour in Hawaiian crows Corvus hawaiiensis 

      Klump, Barbara C.; Masuda, Bryce M.; St Clair, James J. H.; Rutz, Christian (2018-10-21) - Journal article
      Very few animal species habitually make and use foraging tools. We recently discovered that the Hawaiian crow is a highly skilled, natural tool user. Most captive adults in our experiment spontaneously used sticks to access ...
    • Raw-material selectivity in hook-tool-crafting New Caledonian crows 

      Klump, Barbara Christina; Cantat, Mathieu; Rutz, Christian (2019-02) - Journal article
      Animals that manufacture foraging tools face the challenge of identifying suitable raw materials among a multitude of options. New Caledonian crows exhibit strong population-specific material preferences for the manufacture ...
    • Strong between-site variation in New Caledonian crows' use of hook-tool-making materials 

      St Clair, James; Klump, Barbara Christina; van der Wal, Jessica Eva Megan; Sugasawa, Shoko; Rutz, Christian (2016-06) - Journal article
      Functional tool use requires the selection of appropriate raw materials. New Caledonian crows Corvus moneduloides are known for their extraordinary tool-making behaviour, including the crafting of hooked stick tools from ...
    • An ‘unkindness’ of ravens? Measuring prosocial preferences in Corvus corax 

      Lambert, Megan L.; Massen, Jorg J. M.; Seed, Amanda M.; Bugnyar, Thomas; Slocombe, Katie E. (2017-01) - Journal article
      In recent years, there has been considerable research effort to determine whether other species exhibit prosocial motivations parallel to those of humans; however, these studies have focused primarily on primates, and with ...