There are more than 300 species of octopus living in diverse habitats that span coral reefs, seagrass beds, sand plains and polar ice regions where they feed on lower trophic levels. Most famous for having eight arms (octopus comes from the Greek, octópus, which means "eight foot"), the behavioral ecology of these mysterious sea creatures, especially octopuses that share habitats, is important for understanding the role they play in community structure and biodiversity of an ecosystem. Coexistence has been well studied in many species, but seldom in cephalopods like octopuses.