Ratites

Ratites are large, flightless birds characterized by their flat breastbones, which lack the keel necessary for flight muscle attachment. They include species like ostriches, emus, rheas, cassowaries, and kiwis. Native mainly to Africa, Australia, South America, and New Guinea, ratites are known for their powerful legs, used for running or defense, and their generally large size. Their evolutionary history suggests they share a common ancestor, with their flightlessness evolving independently due to their environments. Ratites play important roles in their ecosystems and have cultural and economic significance in various regions.