Crabs are frequently preyed upon by halibut, dogfish, sculpins, octopus, otters, sea turtles, and even other species of crabs. Young crabs may sometimes be eaten by their own species. Crab larvae might be eaten by pretty much anything that eats plankton.
the natural predators for a hermit crab is the octopus
Crabs have few natural predators due to their protective shell. They are most susceptible to attacks from fellow crabs for shells or for nutrition.
rock crabs, sea urchins,and the giant Triton
Octopus eat many crustaceans, and I believe that they also eat coral crabs as well.
The natural predators of cnidarians are Sea Turtles, fish that eat coral, such as Parrotfish, Echinoderms, such as Starfish, and crustaceans, like Crabs.
In their natural habitat, less predators are out at night which means they are safer at night.
It doesn't crabs are known to viciously attack any of their predators on sight
The crabs uses its claws.
Arrow Crabs are predators of jellyfish
The Alaskan King Crab also has several natural predators that consider them a food source. Fish such as the halibut or pacific cod are good examples of predators as well as sea otters, octopuses and other types of Crab.
camouflage crabs live in rockpools and other marine places they camouflage themselves with whatever natural things they have with them (mud, leaves and corals). that's how they hide from their predators.