Ratite birds are a group of flightless birds that include emus (4 letters), emeus (5 letters), and rheas (5 letters). These birds are characterized by their flat breastbones, which lack the keel structure found in other birds. They are found in many parts of the world, including Australia, South America, and Africa. Ratite birds are also known for their large size and long legs. They are omnivorous, eating both plants and animals.