The size of brain is matter of debate among scientists. The Bottlenose dolphins have bigger brain than human beings weighing 1.6 kg. This is four times more than average chimpanzee brain. Huge brain has resulted in strong social behavior and intelligence in the dolphins but you can imagine those performing complex tasks like human beings. The symbol based communication system is easily understood by these creatures.
Even mirror self-recognition has been demonstrated by some dolphins. The comparison between brain size and intellectual capacity is fascinating researchers. More research needs to be done in this domain of animal kingdom. In case of humans, bigger brain doesn’t show better intelligence. Albert Einstein, one of the most intelligent human had average-sized brain. Computations capacity of the brain can be calculated through the analysis of brain cells on molecular scale.
As far as other species are concerned, bigger brain gives more opportunities to survive in the evolution. The scientists observed that female guppies with bigger brains posses better surviving skills and high cognitive powers than smaller brain guppies. The scientists still don’t have an answer to how certain species managed to grow large brain. Brain sizes in vertebrates have been studied widely.
The genetic structure of guppies and zebrafish would studied by researchers t University of Helsinkio now. On being asked about choice of subjects on the experiment, scientists said that the factors controlling the growth of brain in these species are similar to human beings. These organisms also show neutral model of genetic makeup.