Comparisons of the brains of dolphins, monkeys, man, and other mammals showed that dolphins had even more folds in their cerebral cortexes than humans, suggesting that dolphins are highly intelligent.
在比較人腦、海豚腦和其他陸生哺乳動物腦部結構時，發現海豚腦的皺摺甚至比人還多，可能具備極高的智慧。