Kea cooperate better with sharing affiliates.

Area of Science:

• Comparative psychology
• Avian behavior
• Evolutionary biology

Background:

• Intraspecific cooperation studies reveal cross-taxa similarities and differences.
• Comparisons across species like primates, fish, and birds offer insights into cooperation's evolution.
• Data on avian cooperation, particularly in birds, remains less extensive than in primates.

Purpose of the Study:

• To investigate cooperation in the New Zealand kea (a psittaciform bird) using a dyadic cooperation task.
• To examine the influence of social affiliation and reward division on cooperation attempts and success.
• To compare kea cooperation abilities with those of other taxa, including primates and other birds.

Main Methods:

• A loose-string cooperation task was employed with kea subjects in separate compartments.
• Ten kea individuals were tested in 44 partner combinations, allowing for examination of reward division.
• Social affiliation scores and reward distribution were recorded to analyze their impact on cooperation.

Main Results:

• Dyads with higher affiliation scores cooperated more frequently and successfully.
• More equal reward sharing correlated with a higher likelihood of attempting cooperation in subsequent trials.
• Kea, similar to other birds and some monkeys, did not spontaneously understand the partner's role or the task mechanism, unlike chimpanzees.

Conclusions:

• Social bonds and equitable reward distribution appear to influence cooperation in kea.
• The observed lack of spontaneous task understanding may indicate species-specific differences or be influenced by task design and experience.
• Further research is needed to fully elucidate the cognitive mechanisms underlying cooperation in birds.