The sea creature known for its eight arms is the octopus. Belonging to the class Cephalopoda, octopuses are highly intelligent and demonstrate remarkable problem-solving abilities, including the use of tools. Each arm has a complex structure equipped with suction cups that allow the octopus to explore its surroundings, capture prey, and navigate through its habitat. Apart from their arms, octopuses can exhibit a range of colors and textures due to special pigment cells in their skin, enabling them to camouflage effectively in their environments. Their unique biology and behavior make octopuses fascinating subjects for research in marine biology and animal intelligence.