So much for the new Dolphin taxi drivers!
Not really. There are at least 41 species of dolphin, ranging from the Hector’s Dolphin, which weighs about 150lbs to the Orca, which can weigh five tons. I’m assuming the specimin on the chart comes from the Bottlenose (or Common) Dolphin, the one people are used to seeing at Seaworld. Those guys average about 500 pounds. The average weight of a human is about 150 pounds. The average weight of a Chimpanzee is about 115 pounds. If the brains on the chart are drawn to scale, the Dolphin brain would have to be substantially larger to compare to the Chimpanzee or Human brain.