The more researchers learn about the great apes—chimpanzees, bonobos, gorillas, and orangutans (see Our Family Tree)—the more evidence they find of creative intelligence. What, then, is the essential difference between us and them? ''Ape Genius,'' a NOVA-National Geographic special, explores that provocative question and examines ...

Long recognized as one of the most intelligent birds, the raven also has a less than savory image throughout history as a scavenger that does not discriminate between humans and animals. Ingenious and versatile, ravens are members of the crow family, which includes jays and magpies. They are found everywhere in the northern hemisphere and ...