Look at their description, the environment they live in, their shells and competition for the same.
Interesting information and videos about hermit crab's symbiotic relationship with sea anemone, upgrading their shells, and finding food.
As a hermit crab grows its shell becomes a tighter fit so eventually the crabs need to move into a bigger one, leading to an amazing exchange. Watch this video.
Are you or someone you know thinking about purchasing a hermit crab as a "starter pet?" Read this list to shed light on the hermit crab industry.