the largest individuals can reach up to in height. Measured from the bill to the tail, emus range in length from , with males averaging and females averaging . Emus are the fourth or fifth heaviest living bird after the two species of ostrich and two larger species of cassowary, weighing slightly more on average than an emperor penguin. Adult emus weigh between , with an average of in males and females, respectively. Females are usually slightly larger than males and are substantially wider across the rump.