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♦ ¹PARROT CLAYLICKS: DISTRIBUTION, PATTERNS OF USE AND ECOLOGICAL CORRELATES FROM A PARROT ASSEMBLAGE IN SOUTHEASTERN PERU, ALAN TRISTRAM KENNETH LEE, dissertation for DOCTOR OF PHILOSOPHY, Manchester Metropolitan University, November 2010
♦ ²The Feeding Ecology of Tanagers and Honeycreepers in Trinidad, Barbara K. Snow and D. W. Snow, The Auk Vol. 88, No. 2 (Apr., 1971), pp. 291-322