Birds that have a breastbone designed for flight are classified as:

Name: Birds that have a breastbone designed for flight are classified as:
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Carinates, also known as "flying birds," have a keeled sternum (breastbone) that provides attachment points for powerful flight muscles. Chelicerates, Mandibulates, and Monotremes are all classifications of arthropods and mammals, which are not birds. Ratites are flightless birds, meaning they do not have a keeled sternum.

Birds That Have a Breastbone Designed for Flight Are Classified