A.  Müllner, Linsenmair, K. E., and Wikelski, M., ?Exposure to ecotourism reduces survival and affects stress response in hoatzin chicks (Opisthocomus hoazin)?, Biological Conservation, vol. 118, pp. 549-558, 2004.

A.  Giraldo, Hernández, C., Gómez, C., Castillo, F., and Saavedra, J. E., ?First breeding record of Wilson?s Plover (Charadrius wilsonia) from the Pacific Coast of Colombia?, Wilson Bulletin, vol. 116, pp. 104-105, 2004.

R. P.  Gerhardt, Gerhardt, D. M., and Vásquez, M. A., ?Food delivered to nests of Swallow-tailed Kites in Tikal National Park, Guatemala?, Condor, vol. 106, pp. 177-181, 2004.

K. D.  Meyer, McGehee, S. M., and Callopy, M. W., ?Food deliveries at Swallow-tailed Kite nests in southern Florida?, Condor, vol. 106, pp. 171-176, 2004.

N.  Cleere and Ingels, J., ?Further observations on the Blackish Nightjar Caprimulgus nigrescens in French Guiana?, Alauda, vol. 72, pp. 285-289, 2004.

E. D. M. C. Wi Ferree and Anderson, D. J., ?Hormonal correlates of siblicide in Nazca boobies: support for the challenge hypothesis?, Hormones and Behavior, vol. 46, pp. 665-662, 2004.

J. F.  Freile and Chaves, J. A., ?Interesting distributional records and notes on the biology of bird species from a cloud forest reserve in north-west Ecuador?, Bulletin of the British Ornithologists? Club, vol. 124, pp. 6-16, 2004.

B. I.  Tieleman, Williams, J. B., and Ricklefs, R. E., ?Nest attentiveness and egg temperature do not explain the variation in incubation periods in tropical birds?, Functional Ecology, vol. 18, pp. 571-577, 2004.

I.  Hahn, Römer, U., and Schlatter, R. P., ?Nest sites and breeding ecology of the Masafuera Rayadito (Aphrastura masafuerae) on Alejandro Selkirk Island, Chile?, Journal of Ornithology, vol. 145, pp. 93-97, 2004.

V. S.  da S.  Fonesca, Petry, M. V., and Fonesca, F. L.  de S., ?A new breeding colongy of the Saffron-cowled Blackbird (Xanthopsar flavus) in Rio Grande do Sul, Brazil?, Ornitolog{\'?a Neotropical, vol. 15, pp. 133-137, 2004.

A.  Rodr{\'?guez-Ferraro and Azpiroz, A. B., ?Nidificación del Caracolero (Haematopus palliatus) en la Pen{\'?nsula de Paraguaná, Venezuela?, Ornitolog{\'?a Neotropical, vol. 15, pp. 269-270, 2004.

H. F.  Greeney, Gelis, R. A., and White, R., ?Notes on breeding birds from an Ecuadorian lowland forest?, Bulletin of the British Ornithologists? Club, vol. 124, pp. 28-37, 2004.

J. F.  Freile, ?Range extensions and other notewothy and new bird records from mainland Ecuador?, Bulletin of the British Ornithologists? Club, vol. 124, pp. 188-202, 2004.

M.  Hau, Stoddard, S. T., and Soma, K. K., ?Territorial aggression and hormones during the non-breeding season in a tropical bird?, Hormones and Behavior, vol. 45, pp. 40-49, 2004.

J. A.  Sheridan, Bessinger, S. R., and Hughes, C. R., ?Weak association between measures of health and reproductive success in Green-rumped Parrotlets (Forpus passerinus) in Venezuela?, Auk, vol. 121, pp. 717-725, 2004.

R.  Rodr{\'?guez-Mojica, ?Yellow Warbler Dendroica petechia cruciana successfully nesting in a man-made, disturbed location?, Cotinga, vol. 21, pp. 73-74, 2004.

H. F.  Greeney, Gelis, R. A., Hannelly, E. C., and DeVries, P. J., ?The egg and incubation period of the Peruvian Antpitta (Grallaricula peruviana)?, Ornitolog{\'?a Neotropical, vol. 15, pp. 403-406, 2004.

H. F.  Greeney, Hannelly, E. C., and Lysinger, M., ?First description of the nest and vocalisations of the Peruvian Antpitta Grallaricula peruviana with a northward range extension?, Cotinga, vol. 21, pp. 14-17, 2004.

E. M.  Kofoed and Auer, S. K., ?First description of the nest, eggs, young, and breeding behavior of the Great Antpitta (Grallaria excelsa)?, Wilson Bulletin, vol. 116, pp. 105-108, 2004.

R. C.  Dobbs, Greeney, H. F., and Martin, P. R., ?The nest and nesting behavior of the Rusty-winged Barbtail (Premnornis guttuligera)?, Wilson Bulletin, vol. 115, pp. 267-373, 2004.

H. F.  Greeney, ?A nest of the Spot-fronted Swift Cypseloides cherriei in eastern Ecuador?, Bulletin of the British Ornithologists? Club, vol. 124, pp. 154-156, 2004.

J. W.  Armacost, Jr., ?The nest, eggs, and nestlings of the Castelnau?s Antshrike, (Thamnophilus cryptoleucus) with notes on its ecology and conservation?, Wilson Bulletin, vol. 116, pp. 262-266, 2004.

G. A.  Londoño, Saavedra-R., C. A., Osorio, D., and Mart{\'?nez, J., ?Notas sobre la anidación del Tororoi Bigotudo (Grallaria alleni) en la Cordillera Central de Colombia?, Ornitolog{\'?a Colombiana, vol. 2, pp. 19-24, 2004.

R.  Strewe, ?{Notas sobre una colonia de anidac{\'?on del vencejo pierniblanco (Aeronautes montivagus) en la Serran{\'?a de Perijá?, Bolet{\'?n de la Sociedad Antioqueña de Ornitolog{\'?a, vol. 14, pp. 2-4, 2004.

H. F.  Greeney, Krabbe, N., Lysinger, M., and Funk, W. C., ?Observations on the breeding and vocalizations of the Fulvous-breasted Flatbill (Rhynchocyclus fulvipectus) in eastern Ecuador?, Ornitolog{\'?a Neotropical, vol. 15, pp. 365-370, 2004.

G. R.  Angehr, Christian, D. G., and Aparicio, K. M., ?A survey of the Serran{\'?a de Jungurudó, an isolated mountain range in eastern Panama?, Bulletin of the British Ornithologists? Club, pp. 51-62, 2004.

E. B.  Cohen and Lindell, C. A., ?Survival, habitat use, and movements of fledgling White-throated Robins (Turdus assimilis) in a Costa Rican agricultural landscape?, Auk, vol. 121, pp. 404-414, 2004.

E. C.  Berg, ?A test of sex-ratio biasing in the White-throated Magpie-jay, a cooperative breeder with female helpers?, Condor, vol. 106, pp. 299-308, 2004.

K.  Renton, ?Agnostic interactions of nesting and nonbreeding macaws?, Condor, vol. 106, pp. 354-362, 2004.

C.  Duca and Marini, M. Â., ?Aspectos da nidifica{\c c}ão de Cacicus haemorrhous (Passeriformes, Icterinae) no sudeste do Brasil?, Revista Brasileira de Ornitologia, vol. 12, 2004.

L. P.  Nguyen, Rockwell, R. F., and Larsen, D., ?Atypical nest site of a Semipalmated Plover?, Wilson Bulletin, vol. 116, pp. 184-186, 2004.

I. R.  Lamas and Santos, J. P. A., ?Brazilian Merganser Mergus octosetaceus nest in a rock crevice, with reproductive notes?, Cotinga, vol. 22, pp. 38-41, 2004.

A.  Morales-Rozo and de la Zerda, S., ?Caracterización y uso de hábitat del Cucarachero de Pantano Cistothorus apolinari (Troglodytidae) en humedales de la Cordillera Oriental de Colombia?, Ornitolog{\'?a Colombiana, vol. 2, pp. 4-18, 2004.

G. R.  Graves, ?Diagnoses of hybrid hummingbirds (Aves: Trochilidae). 13. An undescribed intrageneric combination, Heliodoxa imperatrix X Heliodoxa jacula?, Proceedings of the Biological Society of Washington, vol. 117, pp. 10-16, 2004.

G. R.  Hepp, ?Early onset of incubation by Wood Ducks?, Condor, vol. 106, pp. 182-186, 2004.

P.  Caycedo-Rosales, Cardona, R. J., and Pulido-Santacruz, P., ?El nido del Tapaculo Ocelado (Acropternis orthonyx)?, Ornitolog{\'?a Colombiana, vol. 2, pp. 41-44, 2004.

C.  Bosque, Pacheco, M. A., and Garc{\'?a-Amado, M. A., ?The annual cycle of Columbina ground-doves in seasonal savannas of Venezuela?, Journal of Field Ornithology, vol. 75, pp. 1-17, 2004.

H. F.  Greeney, ?Breeding behavior of the Bicolored Antvireo (Dysithamnus occidentalis)?, Ornitolog{\'?a Neotropical, vol. 15, pp. 349-356, 2004.

S. D.  Bella and de Azevedo-Junior, S. M., ?Considera{\c c}ões sobre a ocorrência da gar{\c c}a-vaqueira, Bubulcus ibis (Linneaus) (Arves, Ardeidae), em Pernambuco, Brasil?, Revista brasileira de Zoologia, vol. 21, pp. 57-63, 2004.

P. R.  Martin and Dobbs, R. C., ?Description of the nest, egg and nestling of Watkin?s Antpitta Grallaria watkinsi?, Cotinga, vol. 21, pp. 35-37, 2004.