A novel tool-use mode in animals: New Caledonian crows insert tools to transport objects

Area of Science:

• Animal Behavior
• Cognitive Ecology
• Avian Intelligence

Background:

• New Caledonian crows (Corvus moneduloides) are renowned for sophisticated tool use, including manufacturing and caching.
• Their tool use is crucial for foraging and accessing prey.
• Previous research highlights their advanced cognitive abilities related to tool manipulation.

Purpose of the Study:

• To document and describe a previously unreported mode of tool use in New Caledonian crows.
• To investigate the potential functions and contexts of this novel behavior.
• To explore the flexibility and adaptive significance of this tool-use strategy.

Main Methods:

• Direct observation of tool use in two individual New Caledonian crows.
• Detailed recording of the insert-and-transport tool-use events, including object types and context.
• Analysis of video footage to understand the mechanics and purpose of the behavior.

Main Results:

• Six instances of insert-and-transport tool use were observed.
• Objects transported were consistently non-food items.
• In one case, a tool was used to transport an object too large for the beak, suggesting object control facilitation.

Conclusions:

• New Caledonian crows demonstrate a novel tool-use behavior: insert-and-transport.
• This behavior may serve to transport otherwise unmanageable objects or be linked to play and exploration.
• Further research is needed to determine its adaptive value in the wild and its flexible application.