C. Vaughan, M. Bremer, and F. Dear, “Scarlet Macaw (Ara <i>macao</i>) (Psitaciformes: Psittacidae) Parental Nest Visitation in Costa Rica: Implications for Research and Conservation”, Rev. Biol. Trop., vol. 57, no. 1-2, pp. 395–, Jun. 2009.