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Animals can sense Earthquake in Advance?

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From ancient times, it was known that animals act strange enough to predict some natural disaster and now Cambridge University researchers are able to correlate directly with the earthquake occurrence with  strange animal behavior based on both scientific and empirical data. The study was led by Dr Rachel Grant of Anglia Ruskin University. The researchers used data gathered from a chain of motion-triggered cameras placed in the Yanachaga National Park in Peru. It was long believed that animals can sense natural disasters like earthquake. A new study has confirmed the same for the first time when scientists measured any unusual changes in behaviors of animals prior to an earthquake, suggesting animals can sense natural calamity. The study can give an insight into short-term seismic forecasting in the near future.
A large variation was noted eight days before the quake, which overlapped with the second noteworthy decrease in animal activity witnessed in the pre-earthquake period. Scientists used motion-triggered cameras to observe the behavior of animals in the Yanachaga National Park in Peru. On the normal day, cameras recorded 5-15 animal sightings. However, in 23 days before the earthquake, researchers recorded five or fewer sightings. Scientists were astonished to see that no animal movement was recorded at all within 7 days of earthquake, which was incredibly unusual for this mountainous rainforest region.
Another recording of a very low frequency (VLF) radio waves in the area gave away the scientists disturbances in the ionosphere during the period, especially 8 days before the disaster.

It is believed that positive airborne ions are added into the atmosphere before the seismic activity which has a deep effect on mammals and birds.