Assertion: american crow's family | /r/HasProperty | teratornithidae
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text: The heaviest bird ever capable of flight was Argentavis magnificens, the largest member of the now extinct family Teratornithidae, found in Miocene-aged fossil beds of Argentina, with a wingspan up to 5–6 m (16–20 ft), a length of up to 1.26 m (4.1 ft), a height on the ground of up to 1.5–2 m (4.9–6.6 ft) and a body weight of at least 71 kg (157 lb).