Over 20 million people affected, one-fifth of Pakistan's total land went underwater and a death rate close to 2,000 - This was the after-effect of the devastating flood that hit the country in the month of July, 2010.

Almost ten years of rain fell in one week causing extensive loss of crops and property. However, a recent report by the UK Department for International Department (DFID) revealed a shocking side-effect of the floods which showed that humans were not the sole sufferers of the natural disaster.

Millions of spiders climbed the trees in the Sindh province of Pakistan and in the neighboring areas to escape the rising floodwaters.

Start the slideshow to get a glimpse of the unusual phenomenon: