Why are snakes leaving hibernation early? Could they be sensing upcoming earthquakes and natural disasters

Throughout history, there have been many anecdotes indicating that animals can predict natural disasters. In 1975, for instance, hundreds of snakes in the Chinese city of Haicheng reportedly came out of hibernation days before a devastating 7.3-magnitude earthquake struck. In 2014, golden-winged warblers flew 700 kilometres from their Tennessee breeding grounds ahead of a spate of tornadoes, just days from completing their 5,000-kilometre migration, suggesting animals may sense environmental cues like vibrations, pressure changes, or electromagnetic shifts before disasters occur.From 'demon cats' said to haunt the White House to fish believed to predict tsunamis, folklore and anecdotal reports frequently portrayed animals as having a bizarre ability to predict danger. Historical accounts of this sort can be tracked down through classic literature as far back as Ancient Greece, where Thucydides described rats, snakes, dogs, and weasels leaving the city of Helice in droves before an earthquake in 373 BC.The concept of animals being early warning systems is extremely attractive, especially considering the fact that most disasters occur with little or no warning at all. Although modern meteorology can accurately predict the possibilities of hurricanes, flooding, or storms, seismology cannot predict the occurrence of an earthquake. Tsunami alerts resulting from earth movements may sometimes be possible with the help of early warning devices, although some areas may lack the necessary infrastructure to support the alerting system.Despite many reports, there is little science available that supports the predictive powers of animals as reported by Discover Wildlife. It is not easy for researchers to get baseline data on normal behaviour because any unusual behaviour is normally reported in hindsight after a disaster has taken place. Human biases, for example, confirmation biases, come into play.Some scientists have even proposed that animals may be able to sense small amounts of environmental change, such as differences in air pressure, vibrations, and variations in geomagnetic fields, which occur before a disaster strikes. Many animals are actually more attuned to the environment than humans, although there is as yet no concrete proof that this ability can be utilised for predictive purposes.A study conducted in the GFZ Helmholtz Centre for Geosciences, located in Germany, analysed 180 studies in 2018 concerning the unusual behaviour of animals before an earthquake. The researchers pointed out the possibility of the anomaly happening at the time of the foreshock, which is a small tremor before the actual quake. Essentially, the animals could be reacting to the tremor and not the quake itself.Nevertheless, research goes on. Investigations have been carried out by researchers at the Max Planck Institute of Animal Behavior in Germany. The research involves monitoring cows, sheep, dogs, and goats in areas where seismic activity has occurred in Italy. The research project by the institute’s ICARUS (International Cooperation for Animal Research Using Space) utilises transmitters placed on animals to track their activity.While the following studies have not concluded whether the animals have the capability of predicting these disasters successfully, they have been useful in providing insight regarding how the animals react in a changing environment, hence providing possible useful information regarding the prediction of these disasters.