When human measures for intelligence are applied to other species, dolphins are second only to Homo sapiens in brainpower, according to Lori Marino, a senior lecturer in neuroscience and behavioral biology at Emory University.
"If we use relative brain size as a metric of 'intelligence' then one would have to conclude that dolphins are second in intelligence to modern humans," Marino, who performed several MRI scans on dolphin brains, told Discovery News.
It should then come as no surprise that a dolphin recently emitted the whistle for the word "sargassum," referring to a type of seaweed commonly found in the dolphin's marine environment.
In the future, high-tech devices might allow people and dolphins to hold conversations with each other. Given how much damage humans have done to the environment and to other species, we might get quite an earful.