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Ravens: Feeding Tactics. String-pulling. Experiment one – test ability to pull-up in order to get the meat on the string to come up Experiment two – test ability to pull-down in order for the meat on the string to come up. String-pulling.

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String pulling l.jpg
String-pulling

  • Experiment one – test ability to pull-up in order to get the meat on the string to come up

  • Experiment two – test ability to pull-down in order for the meat on the string to come up


String pulling3 l.jpg
String-pulling

  • Best way for the meat to be obtained is by using a combination of pulling and stepping

  • For pull-up task, grab string with beak, pull up, step on string loop, let go of the string, repeat

  • For pull-down task, same thing only pulling down instead of pulling up

  • Results



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Scrounging

  • Co-feeding with wolves

  • Scrounging tactic most used was displacing

  • When no more food could be taken from the site, stealing increased and displacing decreased

  • Co-feeding with boars

  • Sharing more common among the this site than the wolves site

  • While, more individuals with food were targets of displacing at the wolf site than the boar site


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Social Settings

  • Misleading others for a chance at food

  • For days one through eighteen

  • When Hugin would find the box with the reward, Munin would displace him from the opened box

  • For days nineteen through thirty-eight

  • Munin still targeted Hugin most of the time, so Hugin always lost the opened box