Porpoises eat many kinds of fish, squid, octopus and other ocean creatures. Their specific diet is influenced by where they live and what kind of fish are available to them, but they always eat a fairly varied diet. More »

A group of porpoises is referred to as a pod. Porpoises tend to travel in very small groups, according to Diffen.com, which analyzes some of the differences between dolphins and porpoises. More »

A dolphin's slimmer body, beak-like nose and curved fins distinguish it from the porpoise's stout build, rounded face and triangular fins, according to the National Ocean Service. Although they are different species, dol... More »

Sharks and whales are enormous ocean creatures that have large, torpedo-shaped bodies and dorsal fins. Both species swim well in the water, use their senses to catch prey and, as meat eaters, rely on carnivorous food to ... More »

Seahorses are eaten by birds, crabs, fish and other sea creatures, but are not a preferred food by many predators because they are primarily made of bones and skin. In order to avoid being eaten, seahorses will change co... More »

The term "plankton" encompasses many different creatures, so the food plankton eat is varied. Phytoplankton, zooplankton and bacterioplankton all use different sources of energy for food. More »

Most sea sponges are detrivorous, meaning they consume organic debris and various microbes that drift through ocean currents. Harp sponges, however, are carnivorous and use hooks located on their arms to catch shrimp and... More »