* Hermit Crabs Need Shells: Hermit crabs are vulnerable without a shell. They have soft abdomens that need protection.
* Empty Snail Shells: Snails grow and abandon their shells as they get bigger.
* Finding a New Home: Hermit crabs find these empty shells and use them as a home. They carry their shell around with them, retreating into it for protection.
* Shell Swapping: As the crab grows, it needs a larger shell. This means they have to find a new shell and switch, often taking a larger one from another crab.
* Mutual Benefit: While hermit crabs get shelter and protection, the snail shells are given a second life and don't go to waste.
This is an example of mutualism, where both species benefit from the relationship.