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Optimal Foraging

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.

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Related Experiment Video

Updated: May 30, 2026

Establishment and Maintenance of Gnotobiotic American Cockroaches (Periplaneta americana)

Establishment and Maintenance of Gnotobiotic American Cockroaches (Periplaneta americana)

Published on: May 28, 2021

Local enhancement promotes cockroach feeding aggregations.

Mathieu Lihoreau¹, Colette Rivault

¹Unité Mixte de Recherche 6552, Centre National de la Recherche Scientifique, Université de Rennes 1, Rennes, France. mathieu.lihoreau@sydney.edu.au

|August 4, 2011

Summary

Cockroaches use social cues from feeding conspecifics to find food. This inadvertent social information, rather than direct signals, influences their foraging decisions and aggregation behavior.

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Last Updated: May 30, 2026

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Area of Science:

Animal behavior
Insect ecology
Social communication

Background:

Animal societies rely on communication and learning for success.
Social insects often signal resource locations to nestmates.
Insects can also acquire information from inadvertent cues left by conspecifics.

Purpose of the Study:

To investigate the use of social information in foraging decisions of gregarious cockroaches (Blattella germanica).
To determine if cockroaches prefer the odor of feeding conspecifics over mixed odors.
To explore the role of inadvertent cues versus signals in cockroach foraging.

Main Methods:

A Y-olfactometer was used to present individual cockroaches with a choice between different odors.
The choices offered were the odor of feeding conspecifics versus a mix of food and non-feeding conspecifics.
The study assessed preferences based on the arm chosen by the cockroaches.

Main Results:

Cockroaches showed a significant preference for the arm scented with the odor of feeding conspecifics.
Social information was produced by all age classes and perceived at close range.
Findings suggest the use of inadvertently provided cues, not deliberate signals.

Conclusions:

Social information from feeding cockroaches influences foraging decisions in Blattella germanica.
Local enhancement, driven by inadvertent cues, likely plays a role in forming feeding aggregations.
Cue-mediated recruitment may underlie various collective behaviors in social insects.