Cat tales: They may have stolen many hearts, and the internet, but cats can be perplexing pets. As much cuddly and playful as they are aloof and uncaring, they've often raised the question: Did humans ever really domesticate felines? And what more can science tell us about a relationship that predates history? Dog tales: Dogs have been our companions for thousands of years. But why? Do they really love us, or are they just in it for the food? Scientists test wolf intelligence, decode canine DNA,.

Wide screen (16x9).

Cat tales --Dog tales.