Flightless bird that require a significant amount of overall metabolic energy, ratites decrease their basal metabolic rate and conserve energy. A study looking at the basal rates of birds found a significant correlation between low basal rate and pectoral muscle mass in kiwis. On the contrary, flightless penguins exude an intermediate basal rate. This is likely because penguins have well-developed pectoral muscles for hunting and diving in the water. For ground feeding birds, a cursorial lifestyle is more economical and allows for easier access to dietary requirements. Flying birds have different wing and feather structures that make flying easier, while flightless birds'
The Angry Birds Movie and Ian Hecox. "The Angry Birds Movie" was released in the United States on May 20, 2016. The film received mixed reviews from critics and was a box office success, grossing over $352 million and becoming the second highest-grossing film of all time to be based on a video game. A sequel is scheduled to be released on August 16, 2019. A reclusive, temperamental outcast bird named Red lives in a village on Bird Island with other flightless birds. When his temper causes a "premature hatching" of another bird's egg, he is sentenced to take an anger management class. Red's