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Related Experiment Video

Updated: Jan 2, 2026

A Behavioral Assay for Investigating the Role of Spatial Memory During Instinctive Defense in Mice

A Behavioral Assay for Investigating the Role of Spatial Memory During Instinctive Defense in Mice

Published on: July 21, 2018

Corvids exhibit dynamic risk assessment during escape.

Kunter Tätte¹, Anders Pape Møller², Raivo Mänd¹

¹Department of Zoology, University of Tartu, Tartu, Estonia.

Behavioural Processes

|December 13, 2019

Summary

Birds dynamically assess predator risk even after escaping. Corvids prolonged escape, altered trajectories, and switched strategies when pursued, indicating ongoing threat evaluation during flight.

Keywords:

Antipredator behaviour Birds Corvidae Escape behaviour Escape duration Risk assessment

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Area of Science:

Animal behavior
Ecology
Evolutionary biology

Background:

Prey assess predator risk before escape.
Post-escape decision-making in prey remains understudied.
Corvids (crows, ravens, etc.) exhibit complex cognitive abilities.

Purpose of the Study:

To compare escape dynamics of three corvid species.
To investigate if predator pursuit influences escape behavior.
To understand dynamic risk assessment during escape.

Main Methods:

Observed escape responses of three corvid species to a human observer.
Compared escape durations, trajectories, and strategy changes.
Analyzed horizontal escape angles and pursuit effects.

Main Results:

Pursued corvids exhibited longer escape durations.
Escape trajectories were significantly modified when followed.
A higher proportion of birds switched to aerial escape when pursued.
Horizontal escape angles suggested ongoing threat monitoring.

Conclusions:

Corvids dynamically assess risk during escape, not just before.
Escape behavior is adjusted to balance predation risk and energy expenditure.
Results support the concept of continuous risk assessment in predator-prey interactions.