1. Anhuf, D., Winkler, H., Motzer, T. & Szarzynski, J. 1999. Geographical and ecological settings of the Surumoni-Crane-Project (Upper Orinoco, Estado Amazonas, Venezuela). Anz. Sitzber. Östem. Akad. Wiss. (in press).
2. Bawa, K. S. 1990. Plant-pollinator interactions in tropical rain forests. Annu. Rev. Ecol. Syst. 21: 399–422.
3. Bierregaard, R. O. Jr. 1990. Species composition and trophic organization of the understory bird community in a central Amazonian terra firme forest. Pp. 217–236. In: Gentry, A. H. (ed.), Four Neotropical rain forests. Yale University Press, New Haven.
4. Brosset, A. 1996. Role of the sibling species in the dynamics of the forest-bird communities in M’Passa (northeastern Gabon). Pp. 251–289. In: Cody, M. L., Smallwood, J. A. (eds), Long-term studies of vertebrate communities. Academic Press, San Diego.
5. Cohn-Haft, M. & Sherry, T. W. 1994. Evolution of avian foraging stereotypies in tropical rain forest habitats. J. Ornithol. 135: 481.