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Adaptive numerical competency in a food-hoarding songbird
Simon Hunt1, Jason Low, K C Burns
1School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand.
Proceedings. Biological Sciences
|July 10, 2008
Summary
New Zealand robins demonstrate a sophisticated numerical sense, using quantity judgments to find more food when retrieving cached prey. This study reveals how wild birds employ number discrimination for foraging.
Area of Science:
- Animal Behavior
- Cognitive Ecology
- Comparative Psychology
Background:
- While many animals can discern small quantities innately and larger quantities with training, the adaptive significance of numerical discrimination in wild populations remains largely unexplored.
- Understanding numerical abilities in wild animals is crucial for comprehending the evolution of cognitive traits.
Purpose of the Study:
- To investigate whether the New Zealand robin (Petroica australis), a food-hoarding songbird, utilizes numerical judgments during the retrieval and pilfering of cached food.
- To determine the extent and accuracy of numerical discrimination in a wild bird species.
Main Methods:
- Wild New Zealand robins were presented with artificial cache sites containing different sequential numbers of mealworms, which were then obscured.
- Experiments controlled for potential confounds such as time, volume, orientation, order, and sensory cues.
- A violation-of-expectancy paradigm assessed search behavior based on expected prey quantity.
Main Results:
- Robins consistently chose cache sites containing a larger number of prey items.
- Discrimination accuracy decreased linearly with increasing total prey numbers, remaining above chance for up to 12 items.
- Birds exhibited longer search times when expecting to retrieve a greater quantity of food.
Conclusions:
- New Zealand robins possess a sophisticated numerical sense that influences their foraging decisions related to cached food.
- These findings provide critical evidence for the adaptive use of numerical competency in wild animals, contributing to our understanding of cognitive evolution.
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