Dolphins have larger brains than humans. So, why aren't they smarter than humans... or, are they? Are those sneaky Dolphins playing dumb? j/k It's my (very limited) understanding that the cortex is responsible for the higher levels of what we think of as intelligence. So, what's different between the Dolphin's cortex and the human's or even chimp's cortex? I think I remember reading that the human cortex has 5 layers. How many layers does the Dolphin's cortex have? And how "intelligent" are Dolphins anyways? Are they more intelligent than Chimps?