Marine researchers based in the Turks & Caicos Islands have cataloged the intricate defensive displays and hunting tactics of the sand octopus, commonly nicknamed the polka-dotopus. The nocturnal species is one of at least eight octopus varieties living in the territory's coastal waters.
Working from the School for Field Studies Center for Marine Resource Studies on South Caicos, student teams led by Associate Professor of Marine Ecology Dr. C.E. O’Brien recorded hours of night footage between 2021 and 2024. Former student Emily Lekas and Dr. O’Brien built an ethogram analyzing the animal's movements frame by frame. They identified 11 behaviors, 10 postures, three skin textures, and six skin patterns split into 16 sub-patterns. To intimidate predators, the creature flashes stark white dots against a brick-red body, while other postures mimic floating algae or fish.
Dr. O’Brien’s team is now investigating the relationships between the sand octopus's skin patterning, behavior, and seafloor substrate to better understand how the animals make decisions in complex marine environments.