Dolphins 2nd smartest after humans
In a new research, scientists have found that dolphins might be the second-smartest animals after humans, as MRI scans show that their brains are four to five times larger for their body size when compared to another animal of similar size.
"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," Lori Marino, a senior lecturer in neuroscience and behavioural biology at Emory University, told Discovery News.
Marino, who has performed several MRI scans on dolphin brains, said that at least two other lines of evidence support her claims about dolphin intelligence.
First, various features of the dolphin neocortex - the part of the brain involved in higher-order thinking and processing of emotional information - are "particularly expanded" in dolphins.
Second, behavioural studies conducted by Marino and other experts demonstrate that dolphins exhibit human-like skills.