Sharing a Shell by Julia Donaldson & Lydia Monks is a lovely little book about sharing and friendship, which we have read over and over again.
The story is about a little hermit crab who is looking for a new home. He finds a lovely shiny shell and moves right in but then he meets an anemone who wants to move in too! He really doesn’t want to share his shell but the anemone explains that he can help ward off predators so will earn his keep. The crab reluctantly agrees and soon realises that having the anemone around is really helpful and they are very happy living together. Then up rocks a bristleworm who also wants to move in. Again, the crab isn’t keen but relents when he realises that the bristleworm will keep the shell nice and clean.