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Why do Cattle Egrets forage with cattle? An analysis from an anti-predation perspective
Junan Kuang1, Yuanxing Ye1, Yu Lei1
1School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China.
Behavioural Processes
|April 25, 2025
Summary
Cattle Egrets foraging with cattle showed increased foraging efficiency but not reduced perceived predation risk. Their lower flight initiation distance was likely due to better foraging, not enhanced safety from more cattle.
Area of Science:
- Animal Behavior
- Ecology
- Risk-Benefit Analysis
Background:
- The risk-benefit trade-off theory is crucial in animal behavior and ecology.
- Cattle Egrets (Bubulcus ibis) foraging with ungulates is well-studied for foraging benefits.
- The anti-predator aspect of this relationship is less understood.
Purpose of the Study:
- To investigate the risk-benefit trade-off for Cattle Egrets foraging with cattle from an anti-predator perspective.
- To compare foraging efficiency and flight initiation distance (FID) when egrets forage alone versus with cattle.
- To assess if increasing cattle numbers affect egret FID and perceived safety.
Main Methods:
- Field study in Yang County, Shaanxi Province, China.
- Comparison of foraging efficiency and FID between egrets foraging with cattle and alone.
- Analysis of FID in relation to varying numbers of cattle.
Main Results:
- Cattle Egrets exhibited significantly higher foraging efficiency when with cattle.
- Egrets showed a significantly lower FID when foraging with cattle compared to foraging alone.
- Increasing cattle numbers did not significantly alter the FID of Cattle Egrets.
Conclusions:
- The lower FID of Cattle Egrets with cattle is primarily linked to enhanced foraging efficiency, not reduced perceived predation risk.
- Cattle presence allows egrets to tolerate predation risks better, likely due to foraging gains.
- This study contributes to understanding the risk-benefit trade-off in animal foraging strategies.
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