Why Do We See Earthworms on Rainy Days?
You must have seen a great number of earthworms around your house, on the roads and on the playground after a rainfall. Most people think that they come out from their underground ‘homes’ after a rain because their burrows are flooded with water. But earthworms aren’t afraid of water. They can live in water for months together, and in fact, die if their skin is dried out.
What these earthworms are actually afraid of is the waterlogged soil which contains carbonic acid. This is formed when certain chemicals in the soil are combined with water. Carbonic acid enters the body of the earthworm through the openings in its skin and can kill it.
So it’s not the rain water but the chemical substance that brings the earthworms out after a rainfall.