There are so many thing of nature that are unrevealed from us and one of them is ‘animal rain’, it might sound little bizarre & unbelievable but it is true and its occurrences have been reported in many countries throughout history.

WHAT IS ANIMAL RAIN?

Well it is a rare meteorological phenomenon in which flightless animals “rain” from the sky.One hypothesis offered to explain this phenomenon is that strong winds traveling over water sometimes pick up creatures such as fish or frogs, and carry them for up to several miles.However, this primary aspect of the phenomenon has never been witnessed or scientifically tested.

The animals most likely to drop from the sky in a rainfall are fish and frogs, with birds coming third. Sometimes the animals survive the fall, especially fish, suggesting a small time gap between the extraction and the actual drop. Several witnesses of raining frogs describe the animals as startled, though healthy, and exhibiting relatively normal behavior shortly after the event. In some incidents, however, the animals are frozen to death or even completely enclosed in blocks of ice.

Most recent occurrences 

• Loreto, Agusan del Sur, Philippines, January 13, 2012
• Lajamanu, Northern Territory, Australia, February 25 and 26, 2010
• Bhanwad, Jamnagar, India, Oct 24, 2009[17]

SCIENTIFIC POINT OF VIEW

More recently, a scientific explanation for the phenomenon has been developed that involves tornadic waterspouts.Waterspouts are capable of capturing objects and animals and lifting them into the air. Under this theory, waterspouts or tornados transport animals to relatively high altitudes, carrying them over large distances. The winds are capable of carrying the animals over a relatively wide area and allow them to fall in a concentrated fashion in a localized area.[8] More specifically, some tornadoes can completely suck up a pond, letting the water and animals fall some distance away in the form of a rain of animals.
[Source]