Researchers reveal true crabs' epic ancient odyssey from sea to land and back again

Crabs are unique and continuously evolving animals, often moving their lifestyles out of marine environments for other environments to do so. The most popular food species can be fully marine (snow crab) or estuarine (Maryland blue crab, Dungeness crab). Some highly terrestrial species can climb trees if they are in higher levels, while others will die if they are fully immersed in water as adults.