What is a ratite?

The definition of a ratite refers to a group of large, flightless birds characterized by their flat, keeless breastbones. This anatomical trait distinguishes them from other bird species, as it affects their ability to fly. Ratites include well-known examples such as ostriches, emus, and kiwis. Their structure is adapted for running rather than flying, allowing them to thrive in diverse habitats where flight is not a necessity for survival. This unique adaptation is a key identifying feature of ratites and provides an insight into their evolutionary history. In contrast, the other options describe different types of birds with distinct characteristics, such as flying birds or aquatic birds, which do not match the specific traits that define ratites.