Memory is one of the most fascinating aspects of intelligence, but how long do different animals remember? In this video, we compare the memory abilities of octopuses, crows, humans, goldfishes, chimpanzees, dogs, elephants, and dolphins—revealing the surprising ways they store and recall information. How Do Scientists Measure Animal Memory? Researchers test memory in animals through various experiments: Delayed recall tests: Animals are trained to perform a task, then tested after hours, days,