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 its tentacles to identify a likely meal. The brain of the octopus has two separate
memory-storage areas, one for visual memories and one for tactile memories.