ravens feeding tactics
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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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Presentation Transcript
string pulling
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
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
scrounging
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
social settings
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
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