Vole hunting: novel predatory and carnivorous behavior by California ground squirrels

Area of Science:

• Ecology
• Animal Behavior
• Zoology

Background:

• Dietary flexibility is crucial for animals to adapt to fluctuating food resources.
• California ground squirrels are typically herbivorous.

Purpose of the Study:

• To document the novel emergence of carnivorous behavior in California ground squirrels.
• To investigate the ecological factors influencing this behavioral shift.

Main Methods:

• Long-term population study of California ground squirrels.
• Documentation of 74 hunting and feeding events using video footage, photographs, and direct observation.
• Analysis of behavioral flexibility in foraging.

Main Results:

• Widespread hunting of California voles by both juvenile and adult ground squirrels was observed.
• Carnivorous feeding behavior was documented in 74 distinct events over two months.
• This behavior coincided with a decadal peak in vole abundance.

Conclusions:

• California ground squirrels demonstrate significant dietary flexibility.
• Environmental conditions, specifically high prey availability, can drive the emergence of novel foraging behaviors.
• This adaptability is key to species survival during resource pulses.