How does the brown tinamou's call differ from the cinereous tinamou's call?
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The vocalizations of the brown tinamou (Crypturellus obsoletus) and the cinereous tinamou (C. cinereus) differ significantly in complexity. The brown tinamou produces a long and astonishingly songlike sequence of whistles, whereas the cinereous tinamou produces a simple monosyllabic call.1