Handling time and choice in pigeons.

Area of Science:

• Behavioral Ecology
• Animal Behavior
• Foraging Theory

Background:

• Optimal foraging theory posits animals maximize energy intake per unit time.
• This suggests preference for larger food items when handling time is minimal.
• Previous research has not fully explored choices between item quantity and size under specific schedules.

Purpose of the Study:

• To investigate pigeon (Columba livia) food preference between single large items and multiple small items.
• To test predictions of optimal foraging theory in a controlled experimental setting.
• To examine how different reinforcement schedules influence choices based on item size and quantity.

Main Methods:

• Pigeons were presented with choices between food options in a shuttlebox.
• Concurrent variable-interval and fixed-cumulative-duration schedules were employed.
• Food options varied in item size (single large vs. multiple small) with equivalent total weight.

Main Results:

• Pigeons consistently preferred the option with numerous small food items over fewer large items.
• This preference was observed across different reinforcement schedules.
• Choosing larger items, despite higher energetic efficiency, led to reduced intake rates under certain conditions.

Conclusions:

• Pigeon foraging behavior deviates from simple optimal foraging theory predictions regarding item size.
• The quantity of food items, rather than solely energetic efficiency, significantly influences foraging choices.
• Reinforcement schedules play a critical role in shaping foraging decisions in pigeons.