Several species of crabs live near hydrothermal vents. The Bythograea crab is one of the top predators of the ecosystem, eating everything from bacteria to clams, and even other crabs. Because of their mobility, they are often the first to colonize a new vent. In comparison to crabs we see on the beach, Bythograea crabs live under pressure 250 times greater than we experience on land, and an adult Bythograea crab will die if brought to the surface.