Hermit crab
Depth: 20 m · Sunlight Zone
The hermit crab has a soft belly and protects it inside an empty snail shell that it carries around. When it grows, it looks for a bigger shell and moves house. Sometimes it even places a sea anemone on its shell, which defends it with its stinging tentacles.
For scientists
Hermit crabs (Paguroidea) have a soft, asymmetrically coiled abdomen that fits neatly into empty snail shells; as they grow they switch to larger shells and, when shells are scarce, form orderly vacancy chains. Many live in symbiosis with sea anemones or sponges, which they place on their shell for camouflage and defense. They are mostly omnivores and important scavengers on the seafloor.
Source: Wikipedia
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