Intelligence Unbound

from New Scientist

No doubt, the human brain has bulged in the six million or so years since our species last shared a common ancestor with chimpanzees, offering more cognitive prowess compared to our closest relatives. But traces of human intelligence, such as a sense of numbers, or the ability to use tools, lurk in a wide range of animals, particularly in other primates.

link: Monkey 'IQ test' hints at intelligent human ancestor - life - 17 June 2009 - New Scientist