Modulation of behavioural laterality in wild New Caledonian crows (Corvus moneduloides): Vocalization, age and...

Area of Science:

• Animal Behavior
• Ethology
• Comparative Psychology

Background:

• New Caledonian crows (Corvus moneduloides) are renowned for complex tool behaviors.
• The development and consistency of behavioral laterality in this species remain poorly understood.
• The role of the bill as a lateralized effector in tool use requires further investigation.

Purpose of the Study:

• To investigate behavioral laterality, including vocalizations, in a wild population of New Caledonian crows.
• To create the first ethogram for this species to systematically analyze laterality.
• To determine if laterality in tool manipulation is consistent across different behavioral categories and individuals.

Main Methods:

• Development of the first ethogram for New Caledonian crows.
• Detailed analysis of close-up video footage of wild, free-flying crows.
• Examination of object manipulation and vocalization behaviors to assess laterality.

Main Results:

• A strong left-sided bias was observed specifically during object manipulation tasks.
• Individual preferences for laterality stabilized during the juvenile years of the crows.
• Variability in laterality was noted, with at least one crow exhibiting right and left biases in different behavioral categories.

Conclusions:

• Behavioral laterality in New Caledonian crows, particularly in tool use, is pronounced but context-specific.
• Significant individual and behavioral variability exists in laterality expression.
• Further research integrating New Caledonian crow biology and ecology is crucial for understanding the evolution of tool-making and laterality.