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Related Experiment Video

Updated: Jun 23, 2026

Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research

Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research

Published on: July 3, 2009

Ghost crab (Ocypode quadrata) modify their behavior during mirror exposure.

Trent Robinson¹

¹Independent Researcher, Gulf Breeze, FL, United States.

Behavioural Processes

|July 4, 2024

Summary

This summary is machine-generated.

Ghost crabs may distinguish their reflections from live crabs. Eye cleaning behavior differed across mirror, clear, and non-reflective partitions, suggesting cognitive abilities in these crustaceans.

Keywords:

Aggression Conspecific Eye cleaning Ghost crab Mirror Self-recognition

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Last Updated: Jun 23, 2026

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Published on: March 31, 2023

Area of Science:

Animal behavior
Cognitive ethology
Marine biology

Background:

Ghost crabs (Ocypode quadrata) show behaviors suggesting self-recognition.
The ability to distinguish self from others is a key cognitive function.

Purpose of the Study:

To investigate if ghost crabs can differentiate between their mirror image and live conspecifics.
To explore the cognitive abilities of ghost crabs in social and self-recognition contexts.

Main Methods:

Ghost crabs were observed in tanks with partitions: one-way mirror, clear (conspecific), and non-reflective.
Behavioral responses including aggression, partition proximity, eye cleaning, and contact were recorded.

Main Results:

Aggression was marginally higher with a conspecific present.
Eye cleaning behavior was significantly reduced when viewing a mirror or non-reflective surface compared to a conspecific.
Crabs made more contact with non-reflective partitions.

Conclusions:

Findings suggest ghost crabs can differentiate mirror images from live conspecifics.
This discrimination may be linked to mirror self-recognition abilities.
Further research is needed to confirm these cognitive capacities.