Research shows dolphins dimwitted but happy

Dolphins and whales are dumber than goldfish and don't have theknow-how to match a rat, new research from South Africa shows.

For years, humans have assumed the large brains of dolphins meantthe mammals were highly intelligent.

Paul Manger from Johannesburg's University of the Witwatersrand,however, says it is not intelligence that created the dolphin super-brain -- it's the cold.

To survive underwater, these warm-blooded animals developed brainsthat have a lot of insulating material -- called glia -- but not toomany neurons, the gray stuff that counts for reasoned thinking.

The same goes for whales because they share the dolphins' …