2024
DOI: 10.21203/rs.3.rs-5405438/v1
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Do Hooded crows (Corvus cornix) understand how a loose string works? 

Anna A. Smirnova,
Maria A. Cheplakova,
Ksenia N. Kubenko

Abstract: In a loose-string task an out-of-reach tray baited with food can only be retrieved by simultaneously pulling on both ends of a string threaded through the loops on the tray. This task is used to assess an animal's ability to cooperate, with each animal only having access to one end of the string. Some studies use the loose-string task in a pre-training phase, during which animals are individually taught to pull both ends of the string. Usually, no additional tests are conducted to determine whether the animals… Show more

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