The animal known for its intelligence and problem-solving ability is the octopus. These cephalopods are recognized for their advanced cognitive abilities, including learning, memory, and the capability to use tools. Their complex nervous system and the structure of their brains are sophisticated, enabling them to demonstrate behaviors such as escaping from enclosures and manipulating objects in their environment. Some species of octopuses can even change colors and textures for camouflage, showcasing their adaptability. Research into octopus intelligence has furthered our understanding of animal cognition in invertebrates, making them fascinating subjects in behavioral ecology.