'Smarts' count: Evolution of intelligence

The Beatles said it best: Love is all you need. And according to new research, the same may be true in the animal kingdom. Well, at least for mosquitofish -- a matchstick-sized fish endemic to Central America and now found globally. According to the scientists, male mosquitofish possess impressive problem-solving skills and can successfully navigate mazes and other tests. Males that perform better have a higher chance of mating.