Deluge

With a whisper on the wind, pre-monsoon showers come to Thailand. Assamese macaque monkeys play in the waters and gorge themselves on a monsoon delicacy of water snails.

To the west, in India, huge banks of cloud roll in, heralding four months of incessant rain. The rains trigger a dramatic response. Male Indian common toads are transformed yellow-gold for just one day. It is their big chance to mate. Within days, insects are everywhere. New filming techniques show, for the first time, how mosquitoes survive the impacts of giant raindrops. Fresh grass draws nomads and their vast herds of livestock back to their homelands. But they are stalked by hungry wolves and hyenas, which move in at night for the kill.