Biology / Bio 2299 · Atom · ~20 seconds
Birds as a Clade Nested within Reptilia
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Current phylogenetic evidence, per Bio 1805, places birds as a clade nested within Reptilia, descended from theropod dinosaurs, not a sister group.
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Skeletal and feather evidence links birds to theropod dinosaurs, supporting placement inside the reptile clade, not beside it.
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This placement follows cladistic practice, per Bio 1805 — excluding birds would make Reptilia paraphyletic, since they share that ancestor.