Researchers recently found that the species should be split into six, maybe even seven, genetically distinct groups.

The carapace, or shell, of a Caribbean king crab is around 5.4 inches (136 millimeters) for males and 4.7 inches (120 millimeters) for females. They can weigh up to 6 pounds (3 Kilograms). Masters at ...

As one of the largest crabs on the Pacific coast, Puget Sound king crab shells can grow over 12 inches (30 centimeters). Puget Sound king crabs are bumpy and multicolored, with spots of red, brown, ...