Structural characters no less important separate the rheas from the emeus; the former can be readily recognized by the rounded form of their contour-feathers, which want the hyporrhachis or after-shaft that in the emeus and cassowaries is so long as to equal the main shaft, and contributes to give t
56-62); it resembles in its general configuration that of the emeus and cassowaries, while it differs from that of Apteryx most obviously by the short and stout bill.
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