Why Do Earthworms Come Out After It Rains?

The video explores why earthworms surface during rain, discussing various hypotheses. The oldest theory suggests they surface to avoid drowning due to slower oxygen diffusion in water. However, some worms can survive submerged, depending on species. Other theories propose that rain offers better travel conditions, mating opportunities, or vibrations mimicking predators like moles. Despite differing views, the video provides insights into worm behavior and acknowledges contributors.

What hypothesis suggests that worms might surface due to vibrations from raindrops?

What is 'worm grunting' and how is it related to earthworm behavior?