wierd_world on Instagram: "The octopus is a fascinating marine animal! Here are some key facts: ​Classification: It's a soft-bodied, eight-limbed mollusc of the order Octopoda, grouped with squids and cuttlefish in the class Cephalopoda. ​Intelligence: Octopuses are considered the most intelligent of all invertebrates. They can solve puzzles, use tools (like coconut shells for shelter), and can open jars. ​Physiology: They have three hearts (two pump blood to the gills, one circulates it to the