Raining Animals - Explanations

Explanations

French physicist André-Marie Ampère was among the first scientists to take seriously accounts of raining animals. He tried to explain rains of frogs with a hypothesis that was eventually refined by other scientists. Speaking in front of the Society of Natural Sciences, Ampère suggested that at times frogs and toads roam the countryside in large numbers, and that the action of violent winds can pick them up and carry them great distances.

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. 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.

This hypothesis appears supported by the type of animals in these rains: small and light, usually aquatic. It is also supported by the fact that the rain of animals is often preceded by a storm. However the theory does not account for how all the animals involved in each individual incident would be from only one species, and not a group of similarly-sized animals from a single area.

In the case of birds, storms may overcome a flock in flight, especially in times of migration. The image to the right shows an example where a group of bats is overtaken by a thunderstorm. The image shows how the phenomenon could take place in some cases. In the image, the bats are in the red zone, which corresponds to winds moving away from the radar station, and enter into a mesocyclone associated with a tornado (in green). These events may occur easily with birds in flight. In contrast, it is harder to find a plausible explanation for rains of terrestrial animals; the enigma persists despite scientific studies.

Sometimes, scientists have been incredulous of extraordinary claims of rains of fish. For example, in the case of a rain of fish in Singapore in 1861, French naturalist Francis de Laporte de Castelnau explained that the supposed rain took place during a migration of walking catfish, which are capable of dragging themselves over the land from one puddle to another. Thus, he argued that the appearance of fish on the ground immediately after a rain was easily explained, as these animals usually move over soft ground or after a rain.