Octopuses exhibit problem-solving skills, use tools, and can adapt to various environments. Their advanced neural structures make them potential candidates for dominance if humans were to go extinct.
Orcas, or killer whales, display complex social behaviors and hunting techniques. They've been observed wearing "salmon hats," a behavior that showcases their cultural learning and social bonding.
Dolphins are known for their advanced communication skills, playful nature, and ability to learn new tasks quickly. Their social structures are intricate, highlighting their cognitive abilities.
Manta rays have the largest brain-to-body ratio of any fish. They exhibit curiosity towards divers and can recognize themselves in mirrors, indicating a level of self-awareness.
Cuttlefish possess the ability to change color and texture rapidly, not just for camouflage but also for communication. Their learning capabilities and memory are subjects of extensive research.