Think you're smart? Plenty of other animals are also adept at complex thinking.

Scientific American Mind features the intelligence of animals in a Dec. 2008 article by Paul Patton:

One World, Many Minds: Intelligence in the Animal Kingdom

From the introduction: "complex brains and sophisticated cognition have arisen multiple times in independent lineages of animals during the earth’s evolutionary history. So-called lower animals, such as fish, reptiles and birds, display a startling array of cognitive capabilities. Goldfish, for instance, have shown they can negotiate watery mazes similar to the way rats do in intelligence tests in the lab."

Read the whole story at Scientific American Mind. While you're there, check out some of the latest stories, including "Did a Comet Hit Earth 12,000 Years Ago?", posted Jan. 2.