A new study published in Science shows that it is possible for bees to be optimistic, especially after being able to experience or indulge in sugar-concentrated water. The researchers want to find out if insects, just like people, are also capable of having positive emotions such as happiness.
When shown pictures of an unfamiliar human with a threatening facial expression, horses become stressed and view the image using their left eye. While similar behaviors have been documented in domestic cats and dogs, this is the first time researchers have found horses can interpret the different emotions of their handlers, too.
New research indicates that dogs can tell the difference between happy and angry human facial expressions.