Hermit crabs can live for more than 30 years in their natural habitats on tropical seashores. They are very social, and need pals, they thrive in large colonies, where they often sleep piled up together. They enjoy climbing, foraging, and exploring, and they even collaborate in teams to find food.
Their gills require high humidity in order to breathe and as their skin doesn’t stretch and grow like ours does, they need very deep, damp sand to burrow under in order to molt.
Source: SIF & peta.org