Tyrannus Vociferans is a Latin term used to describe a bird commonly known as the Cassin's kingbird. This bird belongs to the tyrant flycatcher family and is found in North America. The term Tyrannus Vociferans can be broken down into two words, Tyrannus meaning tyrant and Vociferans meaning loud or vocal. Therefore, synonyms for Tyrannus Vociferans include loud tyrant, vocal kingbird, scolding flycatcher, and raucous ruler. These words describe the bird's striking physical appearance, including its thick black bill, gray head, and back, with a white belly. Cassin's kingbird can be spotted perching on trees, poles, and bushes, emitting loud vocalizations, and fiercely defending its territory from predators and other birds.