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Alpine habitats are expected to support fewer, morphologically distinct congeners that diverge in niche more fully to facilitate stable coexistence. We tested this prediction with a granivorous avian guild consisting of only two Carpodacus members that bred in a Tibetan alpine zone at 4,200–4,600 m a.s.l. These two species, Streaked rosefinch C. rubicilloides weighing 40 g and Pink-rumped rosefinch...
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