Now showing items 1-13 of 13

  • Activity profiles and hook-tool use of New Caledonian crows recorded by bird-borne video cameras 

    Troscianko, Jolyon; Rutz, Christian (2015-12-23) - Journal article
    New Caledonian crows are renowned for their unusually sophisticated tool behaviour. Despite decades of fieldwork, however, very little is known about how they make and use their foraging tools in the wild, which is largely ...
  • Calibrating animal-borne proximity loggers 

    Rutz, Christian; Morrissey, Michael Blair; Burns, Zackory; Burt, John; Otis, Brian; St Clair, James; James, Richard (2015-06) - Journal article
    1. Growing interest in the structure and dynamics of animal social networks has stimulated efforts to develop automated tracking technologies that can reliably record encounters in free-ranging subjects. A particularly ...
  • Cognitive processes associated with sequential tool use in New Caledonian crows 

    Wimpenny, Joanna H.; Weir, Alex A. S.; Clayton, Lisa; Rutz, Christian; Kacelnik, Alex (2009-08-05) - Journal article
    Background: Using tools to act on non-food objects-for example, to make other tools-is considered to be a hallmark of human intelligence, and may have been a crucial step in our evolution. One form of this behaviour, ...
  • 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 ...
  • Discovery of species-wide tool use in the Hawaiian crow 

    Rutz, Christian; Klump, Barbara Christina; Komarczyk, Lisa; Leighton, Rosanna; Kramer, Joshua; Wischnewski, Saskia; Sugasawa, Shoko; Morrissey, Michael Blair; James, Richard; St Clair, James; Switzer, Richard A.; Masuda, Bryce M. (2016-09-15) - Journal article
    Only a handful of bird species are known to use foraging tools in the wild1. Amongst them, the New Caledonian crow (Corvus moneduloides) stands out with its sophisticated tool-making skills2, 3. Despite considerable ...
  • Experimental resource pulses influence social-network dynamics and the potential for information flow in tool-using crows 

    St Clair, James; Burns, Zackory; Bettaney, Elaine; Morrissey, Michael Blair; Otis, Brian; Ryder, Brandt; Fleischer, Robert; James, Richard; Rutz, Christian (2015-11-03) - Journal article
    Social-network dynamics have profound consequences for biological processes such as information flow, but are notoriously difficult to measure in the wild. We used novel transceiver technology to chart association patterns ...
  • 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 ...
  • New Caledonian crows attend to multiple functional properties of complex tools 

    St Clair, James J H; Rutz, Christian (2013-11) - Journal article
    The ability to attend to the functional properties of foraging tools should affect energy-intake rates, fitness components and ultimately the evolutionary dynamics of tool-related behaviour. New Caledonian crows Corvus ...
  • Processing and visualising association data from animal-borne proximity loggers 

    Bettaney, Elaine; James, Richard; St Clair, James; Rutz, Christian (2015-08-29) - Journal article
    Background With increasing interest in animal social networks, field biologists have started exploring the use of advanced tracking technologies for mapping social encounters in free-ranging subjects. Proximity logging, ...
  • Real-time anti-poaching tags could help prevent imminent species extinctions 

    O’Donoghue, Paul; Rutz, Christian (2016-02) - Journal article
    At an estimated $7–10 billion annually, the global trade in illegal wildlife parts is comparable in economic value to human trafficking, and the smuggling of weapons and drugs (Wasser et al. 2008; Wyler & Sheikh 2013). ...
  • 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 ...
  • Tool bending in New Caledonian crows 

    Rutz, Christian; Sugasawa, Shoko; van der Wal, Jessica Eva Megan; Klump, Barbara Christina; St Clair, James (2016-08) - Journal article
    ‘Betty’ the New Caledonian crow astonished the world, when she ‘spontaneously’ bent straight pieces of garden wire into hooked foraging tools. Recent field experiments have revealed that tool bending is part of the species’ ...
  • Tool use as adaptation 

    Biro, Dora; Haslam, Michael; Rutz, Christian (2013-11-19) - Journal article
    Tool use is a vital component of the human behavioural repertoire. The benefits of tool use have often been assumed to be self-evident: by extending control over our environment, we have increased energetic returns and ...