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Non-thermal Effects of Microwave Radiation on Birds

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J. A. Tanner, C. Romero-Sierra, S. J. Davie · 1967

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Chickens instinctively flee microwave radiation within seconds, demonstrating that animals naturally recognize EMF as harmful even at barely-heating levels.

Plain English Summary

Summary written for general audiences

This 1967 study examined how microwave radiation affects birds, finding that chickens exposed to 'slightly thermal' microwave fields (20-50 mW/cm²) showed immediate escape and avoidance behaviors within seconds. The research demonstrated that microwave radiation produces both thermal effects (heating) and non-thermal effects (cellular changes) that can trigger rapid behavioral responses in animals.

Why This Matters

This pioneering study from 1967 provides crucial early evidence that animals can detect and respond to microwave radiation at levels that barely cause heating. The fact that chickens showed immediate avoidance reactions to fields of 20-50 mW/cm² is particularly significant because many of today's wireless devices operate at similar or higher power densities. What this means for you is that biological systems have been demonstrating sensitivity to microwave radiation for over five decades. The chickens' rapid escape behavior suggests an innate recognition that these fields pose a threat, even at levels the telecommunications industry often dismisses as harmless. This research predates the wireless revolution by decades, yet it identified the same non-thermal effects that independent scientists continue to document today in studies of cell phone and WiFi radiation.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
J. A. Tanner, C. Romero-Sierra, S. J. Davie (1967). Non-thermal Effects of Microwave Radiation on Birds.
Show BibTeX
@article{non_thermal_effects_of_microwave_radiation_on_birds_g5277,
  author = {J. A. Tanner and C. Romero-Sierra and S. J. Davie},
  title = {Non-thermal Effects of Microwave Radiation on Birds},
  year = {1967},
  
  
}

Quick Questions About This Study

Yes, chickens exposed to microwave fields at 20-50 mW/cm² showed immediate escape and avoidance behaviors within seconds of exposure, demonstrating an instinctive recognition that these electromagnetic fields pose a threat to their wellbeing.
Birds showed escape reactions to 'slightly thermal' microwave fields at 20-50 mW/cm². These power levels barely cause heating but were sufficient to trigger immediate avoidance behaviors in chickens within seconds of exposure onset.
Birds react within seconds of microwave exposure. The study found that chickens showed escape and avoidance behaviors within just a few seconds of the radiation being turned on, indicating rapid biological detection.
Thermal effects cause temperature increases and heating responses, while non-thermal effects trigger cellular metabolism changes through resonance absorption and induced electromagnetic fields. Non-thermal effects can occur at much lower power levels and different time scales.
This early study established that biological systems can detect and respond to microwave radiation at barely-heating levels, providing foundational evidence for non-thermal effects decades before cell phones and WiFi became widespread consumer technologies.