In contrast to mammals (Mammalia), which possess three middle ear ossicles (malleus, incus, and stapes) and two occipital condyles, birds (Aves) possess a single middle ear ossicle (columella) and a single occipital condyle articulating with the atlas vertebra.
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The statement is True.
The statement accurately presents comparative vertebrate anatomy. Class Mammalia is characterized by three auditory ossicles (malleus, incus, stapes) and two occipital condyles at the base of the skull. Class Aves is characterized by a single auditory ossicle (columella auris) and a single occipital condyle, providing high mobility of the head.
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Skeletal and auditory ossicle differences between Aves and Mammalia