Assertion: condor's bird | /r/HasProperty | archaeopteryx
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Source sentences:
text: Also, the bird skeleton is hollow to reduce weight, and many unnecessary bones have been lost (such as the bony tail of the early bird Archaeopteryx), along with the toothed jaw of early birds, which has been replaced with a lightweight beak.
text: There has also been debate about whether the earliest known bird, Archaeopteryx, could fly.