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| Guittar, John L, Dear, Fiona and Vaughan, Christopher Scarlet Macaw (Ara macao, Psittaciformes: Psittacidae) Nest Characteristics in the Osa Peninsula Conservation Area (ACOSA), Costa Rica. Rev. biol. trop, June 2009, vol.57, no.1-2, p.387-393. ISSN 0034-7744
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