Horses show emotion on their faces just like humans.
That mischievous look of "horsing around" and "why the long face" could be just some of the feelings being expressed by the four-legged animal, after Scientists at University of Sussex used a Equine Facial Action Coding System to discover up to 17 facial movements.
Researcher Jennifer Watham told the Daily Telegraph newspaper: "What surprised us was the rich repertoire of complex facial movements in horses, and how many of them are similar to humans.
"Despite the differences in face structure between horses and humans, we were able to identify some similar expressions in relation to movements of lips and eyes. What we'll now be looking at is how these expressions relate to emotional states."