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Related Experiment Video

Updated: Apr 15, 2026

Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks

Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks

Published on: May 24, 2014

Birds flush early and avoid the rush: an interspecific study.

Diogo S M Samia¹, Daniel T Blumstein²

¹Laboratory of Theoretical Ecology and Synthesis, Department of Ecology, Federal University of Goiás, Goiânia, Goiás, Brazil.

|March 24, 2015

Summary

Prey animals often flee predators to minimize monitoring costs, supporting the Flush Early and Avoid the Rush (FEAR) hypothesis. This finding is crucial for wildlife management and conservation efforts.

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Area of Science:

Behavioral Ecology
Wildlife Biology

Background:

Optimal escape theory (OET) traditionally explains prey escape decisions based on balancing risks and costs.
The Flush Early and Avoid the Rush (FEAR) hypothesis proposes that prey flee to minimize the ubiquitous costs of monitoring predators.

Purpose of the Study:

To comprehensively assess the validity and widespread applicability of the FEAR hypothesis across diverse avian species.
To determine if prey escape behavior is primarily driven by predator monitoring costs.

Main Methods:

Data collection on escape decisions from 178 bird species across 67 families on two continents.
Statistical analysis to evaluate the predictive power of the FEAR hypothesis against traditional OET.

Main Results:

The FEAR hypothesis successfully explains the escape behavior in 79% of the studied bird species.
Evidence suggests that minimizing predator monitoring costs is a primary driver of prey escape decisions in birds.

Conclusions:

The FEAR hypothesis represents a widespread phenomenon influencing avian escape behavior.
Incorporating alert distances into set-back zone designs is essential for effective human-wildlife conflict mitigation and species protection.