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A Real-Time Interactive System for Studying Confrontational Pursuit Behavior in Rodents

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The Human Shield Hypothesis: Does Predator Avoidance of Humans Create Refuges for Prey?

Kaitlyn M Gaynor^1,2, Eamonn I F Wooster³, April Robin Martinig⁴

¹Department of Zoology, The University of British Columbia, Vancouver, British Columbia, Canada.

Ecology Letters

|June 17, 2025

Summary

The human shield hypothesis suggests predators avoid human areas, allowing prey to find refuge. This review finds evidence for this ecological paradigm is context-dependent, requiring further study for wildlife conservation.

Keywords:

animal behaviour habitat selection human disturbance landscape of fear predator–prey interactions recreation systematic review trophic cascades

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Area of Science:

Ecology
Conservation Biology
Wildlife Management

Background:

Anthropogenic disturbance significantly alters ecological communities globally.
The human shield hypothesis (HSH) proposes predators avoid human-disturbed areas, creating safe havens for prey.
The HSH has gained traction but lacks extensive empirical testing.

Purpose of the Study:

To systematically review and evaluate the evidence for the human shield hypothesis.
To assess how the HSH is commonly discussed and tested in ecological research.
To identify ecological and anthropogenic factors influencing the emergence of human shields.

Main Methods:

Systematic literature review of studies testing the human shield hypothesis.
Analysis of the context-dependency of human shield phenomena.
Formal outlining of HSH assumptions to derive predictive contexts.

Main Results:

While clear cases of human shields exist, their occurrence is highly context-specific.
The review highlights a disparity between the popularity of the HSH and the robustness of its empirical tests.
Specific ecological and anthropogenic conditions favoring human shields were predicted.

Conclusions:

The human shield hypothesis is not universally applicable and its emergence depends heavily on environmental and human factors.
Further research is needed to rigorously test the HSH against alternative hypotheses and confounding variables.
Understanding human shields is crucial for effective wildlife conservation and management in human-modified landscapes.