Morphometric differentiation between subspecies of Resplendent Quetzal (Pharomachrus mocinno mocinno and P. m. costaricensis) based on male uppertail-coverts
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Ulrich Schulz, Knut Eisermann. "Morphometric differentiation between subspecies of Resplendent Quetzal (Pharomachrus mocinno mocinno and P. m. costaricensis) based on male uppertail-coverts." Bulletin of the British Ornithologists' Club 137.4 (2017) 287-291