Man's best friend could also be his smartest after scientists concluded dogs can outsmart chimpanzees.
With their human-like brains, chimps have long been rated high on the intelligence scale, but German experts found dogs were better at understanding human requests to retrieve specific objects.
They showed 20 chimps and 32 dogs an object, put it at the back of the room near a similar-looking item and rewarded them with food if they collected the correct one.
More than a quarter of the dogs appeared to understand the task, but none of the chimps bettered a rate higher than chance.
The report, published in science journal PLoS ONE this month, concluded chimps can understand the goals and intentions of others, but struggled to use human's referential gestures to find food.