Other than humans, clams are eaten by many animals. Seagulls and other sea birds will pick up clams and drop them on rocks to open them. Raccoons will eat clams by either crunching them with their teeth or prying them open with their hands. Sea stars (or star fish) are able to completely cover and pry open clams underwater. There are also some kind of fish that will eat clams. California otters Elephant seals Rays
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
Predators of crayfish include snapping turtles, fish large enough to swallow them, frogs large enough to swallow them, snakes, some types of birds, in some areas otters, raccoon's, opossums, bears, and humans. Crayfish are found in several continents so predators may vary.
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.
Octopus eat many crustaceans, and I believe that they also eat coral crabs as well.
rock crabs, sea urchins,and the giant Triton
parrot ,elephant and peruvian fighting frog
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Crabs are both predators and prey. They belong to a level below the top predators (like humans) and above other organisms. They will eat just about anything.
birds and snakes
Crabs avoid predators by walking away from them and hiding under rocks and sand. They can also use their claws to keep predators away.
Crabs have many predators; fish, octopus, snails, starfish, birds, etc.
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chickens
Some predators include crabs, rays, andd tuna
Crabs do get afraid, especially of predators that will harm and eat them. Crabs that feel in danger will use their pincers to fight back.
Crabs, Humans, and something else...
I guess they could, but this is a LOT of kinds of jellyfish, crabs, and sea turtles.
Crabs are not an equivalent of spiders of the sea as they are not predators. They have a somewhat similar appearance with their multiple, long limbs.