According to National Geographic, the common octopus preys on crabs, crayfish and molluscs. Bottom-dwelling octopuses feed mainly on polychaete worms, crabs, whelks and clams. Open-ocean octopuses subsist on prawns, fish and other cephalopods. The giant Pacific octopus feeds on shrimp, clams, lobsters and fish, and even larger prey, such as sharks and birds.Continue Reading
Octopuses hunt at night and usually inject their pray with a paralysing saliva before using their sharp beak to dismember them into small pieces. To access the meat of shelled creatures, octopuses sometimes drill a hole into the shell and inject a secretion through the hole before extracting the mollusc's soft body. Sometimes the shells can be pried open using force.
Octopuses are known for their intelligence and problem-solving skills, and it is believed they are the smartest of all invertebrates, according to About.com. They have unique defense mechanisms, with the most frequently used being their ability to hide with camouflage. This allows an octopus to match the colors, patterns and textures of its surroundings. Octopuses also have the ability to squirt a thick cloud of ink, and escape very quickly using jet-like propulsion. Because they have soft, boneless bodies, octopuses are able to manipulate themselves to fit into very small crevices and cracks.Learn more about Octopi
Shore crabs feed primarily on invertebrates such as molluscs, clams, crustaceans and worms, but they eat practically anything they can get a hold of, including the remains of dead organisms. Their voracious appetites have lead to the regional decline of several species. Shore crabs are an invasive species due to their easily accomodated diets and widespread dispersion.Full Answer >
Crustaceans like crabs, crayfish and lobsters eat seaweed, as do plankton and humans. No seaweed species is known to be poisonous.Full Answer >
Most otters eat crayfish, crabs, fish, frogs and other aquatic invertebrates. The diet of otters varies, however, depends on the species, location of residence and availability of food sources. Small otters generally consume small mollusks, crayfish and crabs, while the largest species eat fish, frogs and even land mammals such as birds, rodents and rabbits.Full Answer >
The Dumbo octopus lives in ocean areas around New Zealand and Austrailia, in the Monterey Bay in California, in the waters around Oregon and the Philippines, as well as in Pupua, New Guinea. It was named for its similarity to Dumbo, the flying elephant featured in a Disney movie.Full Answer >