Cassin’s Kingbird also known as Tyrannus vociferans are medium sized tyrant flycatcher birds, found across western North America. They weigh about 45 g and grow up to 9 inches in size. They have a lifespan of 9 years. These are insectivorous breeds who mainly delve on a diet of insects. They have long sharp beaks which let them catch insects easily. They have bright yellow coloration on their belly and gray heads with darker cheeks.