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Lots of interesting stuff here. But I'm dubious about their conclusions re the chimp vs. dog picking up on "human cues" about the cup of food. It's not clear that human cues had anything to do with the dogs' success. Dogs have a sense of smell that is many, many times keener than that of chimps (ever heard of a bomb-sniffing chimp?), and would have little need for human cues to locate a cup of food in the same room, even if it's in a sealed container. Assuming they were well-trained dogs, I'll bet the only role of the human cues was to convince the dogs that they were allowed to go chow down the food, the existence and precise location of which they had known from the second they were brought into the garage. Silly humans, fooled by the doggies :)