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Related Concept Videos

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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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Related Experiment Video

Updated: Dec 8, 2025

Using Pharmacological Manipulation and High-precision Radio Telemetry to Study the Spatial Cognition in Free-ranging Animals
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Animal navigation: a noisy magnetic sense?

Sönke Johnsen1, Kenneth J Lohmann2, Eric J Warrant3

  • 1Biology Department, Duke University, Durham, NC 27708, USA sjohnsen@duke.edu.

The Journal of Experimental Biology
|September 24, 2020
PubMed
Summary

Animals may not fully rely on Earth's magnetic field for navigation because their magnetic sense is noisy. This requires significant processing, making it less efficient than other cues, though it remains vital when other information is unavailable.

Keywords:
MagnetoreceptionMigrationOrientationSignal-to-noise

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Area of Science:

  • Animal behavior
  • Neuroethology
  • Biophysics

Background:

  • Many organisms utilize Earth's magnetic field for orientation and navigation.
  • Magnetic orientation responses are often difficult to elicit reliably in various settings.
  • The magnetic sense is frequently considered a redundant or backup information source.

Purpose of the Study:

  • To explore why animals do not exclusively rely on the geomagnetic field for navigation.
  • To investigate the hypothesis that the magnetic sense is inherently 'noisy'.
  • To understand the limitations and advantages of magnetoreception in animal orientation.

Main Methods:

  • The study proposes a theoretical explanation based on signal-to-noise ratios in magnetic sensory perception.
  • It reviews existing experimental data on magnetic compass and map responses in animals.
  • The research speculates on the neural processing requirements for magnetoreception.

Main Results:

  • The magnetic sense may be 'noisy' due to small magnetic signals relative to thermal and receptor noise.
  • Magnetic receptors may struggle to acquire precise or accurate magnetic information instantaneously.
  • Significant time-averaging or higher-order neural processing might be necessary for interpreting magnetic cues.

Conclusions:

  • The magnetic sense's inefficiency, due to noise and processing demands, may explain why animals use other cues when available.
  • Despite limitations, magnetoreception persists because the geomagnetic field is sometimes the sole source of navigational information.
  • Understanding the trade-offs between magnetic and non-magnetic cues is crucial for comprehending animal navigation strategies.