The face of a mouse reveals its emotions: study
(PHYSorg.com Biology)

Researchers at the Max Planck Institute of Neurobiology are the first to describe emotional facial expressions for mice. Similar to humans, mouse facial expressions change when it tastes something sweet or bitter, or when it becomes anxious. With this new possibility of measuring the emotions of mice, neurobiologists can investigate the basic mechanisms of how emotions are generated and processed in the brain.