Interspecific communications are evolutionarily beneficial for species living in the same environment. Facial expressions are the most used ways by humans to express emotions. Tate et al.(2006) explored the issue of non-human mammals processing the visual cues from face to achieve interspecific communication with humans. Researchers also examined the avian species' capabilities to interpret this non-verbal communication and be sensitive to human emotions. Based on the experimental subject of American Crows' behavioral changes to varying human gazes and facial expressions, Clucas et al.(2013) identified that crows are able to change their behaviors to human emotions. They further suggested that the high intelligence of the crows enables them to well adapt to human-dominated environments.