Emus are the among the largest living birds on Earth, second only to ostriches. They can grow to be over 6 feet in height, and can weigh over 100 pounds. Ostriches have light tan-colored feathers on their heads and necks, and emus have dark or black-colored feathers on their heads and necks. Ostriches' bodies are covered in dark brown or black feathers, and emus have dirty brown feathers on their bodies.