Mechanical problem solving by plush-crested jays: are tools special after all?

Area of Science:

• Animal Cognition
• Behavioral Ecology
• Comparative Psychology

Background:

• Tool use is linked to behavioral flexibility and innovativeness in species like primates and birds.
• The relationship between general problem-solving skills and tool use competence is not fully understood.
• Investigating whether exceptional physical problem-solvers demonstrate innovative tool use is crucial.

Purpose of the Study:

• To explore if outstanding physical problem-solvers, like the plush-crested jay, exhibit innovative tool use.
• To determine if tool use requires dedicated competencies rather than just general cognitive flexibility.
• To assess tool-related competence in a corvid species new to cognitive research.

Main Methods:

• Tested plush-crested jays (Cyanocorax chrysops) on two tasks of similar manipulative complexity and incentive.
• A non-tool (NT) task involved opening a latched box.
• A tool (T) task required using a rake to retrieve a reward.

Main Results:

• Eight out of nine jays successfully solved the non-tool (NT) task.
• None of the jays learned to solve the tool (T) task.
• Performance suggests tool use is not a direct consequence of high problem-solving proficiency.

Conclusions:

• Tool use appears to involve dedicated competencies specific to manipulation.
• High behavioral flexibility and innovativeness do not automatically confer tool-use abilities.
• Plush-crested jays demonstrate that advanced problem-solving skills may not extend to tool manipulation.