Soft corals, like this orange clump coral (Tubastrea aurea), have internal fleshy skeletons.
When held to the ear, a conch shell acts as an amplifier for some barely inaudible noises.
This giant Pacific octopus (Octopus dofleini) has one or two rows of sensitive suckers on each arm, with which the octopus distinguishes different textures and tastes.
Do you know which is the deadliest of all octopuses?
When the tiny blue-ringed octopus is threatened, its faint blue rings become bright and vivid. This animal has some of the deadliest venom on Earth.
You may eat them, but do you know what a scallop looks like?
A scallop has one large, round muscle that opens and closes its shell. This muscle is the part that's eaten.
A California spiny lobster can live for more than 50 years.
Do you know which animal is sometimes referred to as "sea pork"?
Sea squirts, like this goldmouth sea squirt, feed on plankton, which they filter out of the water with their pharynges.
Many sea snails, like this flamingo tongue snail (Cyphoma gibbosum), lay their eggs on the floors of the tropical oceans where they live.
Most sea stars have five arms each. But some have as many as 40 arms. The number of arms sea stars have often is a multiple of five
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