Assertion: american crow's family | /r/CapableOf | reach their largest size
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text: The most species-rich family in this order, the rails, reaches their largest size in the bulky takahē (Porphyrio hochstetteri) of New Zealand, an endangered species that can weigh up to 4.2 kg (9.3 lb) and measure 0.65 m (2.1 ft) long.