Crabs belong to a group of animals called 'Decapods' - Meaning '10 legs'. This group also includes lobsters, shrimps, and prawns

Sally Lightfoot Crabs (Grapsus grapsus) Galapagos Islands, Ecuador on rock face
Sally Lightfoot Crab (Grapsus grapsus) on rock Galapagos Islands, Ecuador
Sally Lightfoot Crabs (Grapsus grapsus) on rock face. Galapagos Islands, Ecuador
Harlequin Crab (Lissocarcinus orbicularis) on Leopardfish Sea Cucumber (Bohadschia argus) Sulu Sea Palau Lankayan Sabah - Borneo, Malaysia
Porcelain Crab (Neopetrolisthes maculata) in Sea Anemone (Stichodactyla mertensii) Kapalai Reef Ligitan Reefs - Celebes Sea Sabah - Borneo, Malaysia
Anemone carrier, (Dardanus tinctor)
Anemone carrier, hermit crab,(Dardanus tinctor)
spider crab
crab on fan
batwing crab
arrow crab
anemone crab
Spider Crab
Velvet Crab close up
Crab on dendronophyta
Hermit crab
Spider crab on Dendronophthya soft coral
Edible crab
Velvet crab eating fish
Hermit crabs
Velvet crab eating fish