Raining animals is a rare meteorological phenomenon in which flightless animals rain from the sky, although occurrences have been reported from many countries throughout history. One hypothesis that has been 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.
Sometimes the animals survive the fall, suggesting the animals are dropped shortly after extraction. 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 encased in ice. There are examples where the product of the rain is not intact animals, but shredded body parts. Some cases occur just after storms having strong winds, especially during tornadoes.
Rains of animals (as well as rains of blood or blood-like material, and similar anomalies) play a central role in the epistemological writing of Charles Fort, especially in his first book, The Book of the Damned. Fort collected stories of these events and used them both as evidence and as a metaphor in challenging the claims of scientific explanation.
Note that this is a regular occurrence for birds, which can get killed in flight, or stunned, and then fall (unlike flightless creatures, which first have to be lifted into the air by an outside force). Sometimes this happens in large groups, for instance, the Blackbirds falling from the sky in Beebe, Arkansas on December 31, 2010. It's common for birds to become disoriented (for example, because of bad weather or fireworks) and collide with objects such as trees or buildings, killing them or stunning them into falling to death. The number of blackbirds killed in Beebe isn't spectacular considering the size of their congregations, which can be in the millions. The event in Beebe, however, captured the imagination and lead to more reports in the media of birds falling from the sky across the globe, such as in Sweden and Italy, though many scientists claim such mass deaths are common occurrences but usually go unnoticed.