When used for studies of learning and memory , the octopus is a more interesting subject than the squid. Unlike the free-swimming squid, which relies exclusively on its eyes to guide it to a tasty fish or crab, the octopus often feeds off the bottom of the sea. It uses not only its eyes but is tentacles to identify a likely meal. The brain of the octopus has two separate memory-storage area one for visual memories and one for tactile memories.