Assertion: condor's bird | /r/CapableOf | reach a weight of 350 to 400 kg
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Source sentences:
text: The largest carnivorous bird was Brontornis, an extinct flightless bird from South America which reached a weight of 350 to 400 kg (770 to 880 lb) and a height of about 2.8 m (9 ft 2 in).