The coconut octopus (Amphioctopus marginatus) is a small but highly intelligent marine cephalopod known for its remarkable use of tools and adaptive behaviors. Typically reaching 20-30 cm (8-12 inches) in length, this octopus is distinguished by its ability to collect and use coconut shells, seashells, and even discarded bottles to create shelters or camouflage. This behavior highlights its problem-solving skills and resourcefulness, setting it apart from other octopus species.

In addition to its tool use, the coconut octopus is adept at camouflage. It can alter its skin color and texture to blend seamlessly with its surroundings, making it difficult for predators and prey to detect. It also exhibits a unique form of locomotion by walking on two arms while using the other six for manipulating objects or exploring its environment. This bipedal movement is an unusual trait among octopuses and showcases its versatility.

Inhabiting the shallow, tropical waters of the Indo-Pacific region, the coconut octopus prefers environments with ample hiding spots such as coral reefs and sandy seabeds. Its curious and playful nature, coupled with its advanced cognitive abilities, makes it a fascinating subject of study in marine biology and an excellent example of intelligence in cephalopods.