Summary:
- Hermit crabs are a type of crustacean that live in abandoned seashells to protect their soft abdomens.
- As they grow, they must find larger shells to move into, a process called "shell-swapping" that involves carefully evaluating and selecting the right new home.
- Hermit crabs are known for their unique behavior of working together in groups to find and exchange shells, demonstrating a level of social intelligence and cooperation not typically associated with invertebrates.