For centuries, unusual animal behaviour before earthquakes has been reported across the world, from restless livestock to wildlife suddenly disappearing. While long dismissed as folklore, new scientific research suggests there may be some truth behind these observations though experts caution that animals cannot actually predict earthquakes.
Recent findings highlighted by The Conversation indicate that animals may respond to subtle environmental changes that occur before seismic events. However, these responses are not reliable enough to serve as a warning system.
One of the most widely cited examples comes from the 2009 L’Aquila earthquake in Italy, where researchers observed that a large number of common toads abandoned their breeding site days before the quake struck. In another study conducted in Yanachaga National Park, motion-sensitive cameras recorded a sharp decline in animal activity weeks before a major earthquake in 2011, with movement nearly stopping in the final 24 hours.
Scientists say such patterns suggest that animals across different species may be reacting to early changes in their environment. Similar behaviour has also been reported in domestic animals. Studies on dairy cows have shown reduced milk production and increased restlessness before some earthquakes, while surveys following the 2011 Japan earthquake and tsunami found that many pet owners noticed unusual behaviour in dogs and cats shortly before the disaster.
Researchers believe these behavioural changes may be linked to physical processes occurring within the Earth’s crust. According to studies associated with NASA, stress building up in rocks before an earthquake can release electrically charged particles. These particles may alter air quality, water chemistry, or electromagnetic fields changes that animals could be more sensitive to than humans.
Other possible triggers include low-frequency vibrations and sounds beyond human hearing. However, scientists emphasise that it remains unclear which of these signals if any are responsible for the observed behaviour.
Despite growing evidence, experts stress that there is currently no scientific method to predict earthquakes with precision. Many reported cases of unusual animal behaviour are based on anecdotal or post-event observations, which are less reliable than real-time data. In some instances, changes in behaviour may also be explained by normal environmental or seasonal variations.
Ongoing research aims to better understand this phenomenon. Projects in earthquake-prone regions such as Lima, Peru are using tracking devices to monitor animal activity and physiological responses in real time. Scientists are also studying insects like ants, which may react to changes near geological fault lines.
Researchers say combining animal behaviour data with environmental monitoring could improve understanding of pre-earthquake conditions. However, they caution that animal responses alone are unlikely to provide a reliable early warning system.
As global populations grow and exposure to natural disasters increases, understanding all possible indicators of seismic activity remains a priority. For now, animals offer intriguing clues but not a solution to the long-standing challenge of earthquake prediction.