The crown-bird lineage containing ostriches, emus, kiwis, tinamous and relatives. Its palaeognathous palate is an anatomical specialization, not evidence that its members are ancestors of neognaths.
A tinamou is a palaeognath bird native to the Americas. Tinamous can fly, showing that membership in this evolutionary group is not equivalent to flightlessness.
An ostrich is a large flightless palaeognath bird with strong running adaptations. Its reduced flight apparatus and powerful hindlimbs illustrate evolutionary modification of the shared avian body plan.
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