Ratite: Struthionidae (ostriches) Rheidae (rheas) Casuariidae (emus etc.) †Aepyornithidae (elephant birds) †Dinornithidae (moa) Apterygidae (kiwis) Ratite is the common name for any of a group of flightless birds characterized by a flat, raft-like sternum (breastbone) lacking the keel for attachment ... [93%] 2023-02-03