Rendell, L.; Whitehead, H.: Do sperm whales share coda vocalizations? Insights into coda usage from acoustic size measurement. Animal Behaviour 67, pp. 865 - 874 (2004)

Rödl, T.; Goymann, W.; Schwabl, I.; Gwinner, E.: Excremental androgen metabolite concentrations and gonad sizes in temperate zone vs. tropical Stonechats (Saxicola torquata ssp.). General and Comparative Endocrinology 139 (2), pp. 124 - 130 (2004)

Rybak, F.; Gahr, M.: Modulation by steroid hormones of a "sexy" acoustic signal in an Oscine species, the common Canary Serinus Canaria. Anais da Academia Brasileira de Ciências 76 (2), pp. 365 - 367 (2004)

Saether, B. E.; Engen, S.; Lande, R.; Moller, A. P.; Bensch, S.; Hasselquist, D.; Beier, J.; Leisler, B.: Time to extinction in relation to mating system and type of density regulation in populations with two sexes. Journal of Animal Ecology 73 (5), pp. 925 - 934 (2004)

Salewski, V.; Altwegg, R.; Erni, B.; Falk, K. H.; Bairlein, F.; Leisler, B.: Moult of three Palaearctic migrants in their West African winter quarters. Journal of Ornithology 145 (2), pp. 109 - 116 (2004)

Salwiczek, L. H.: Zeitabschätzen bei Putzerfischen. Jahrbuch - Max-Planck-Gesellschaft (2004)

Salwiczek, L. H.; Wickler, W.: Birdsong: An evolutionary parallel to human language. Semiotica 151, pp. 163 - 182 (2004)

Sauberer, N.; Zulka, K. P.; Abensperg-Traun, M.; Berg, H.-M.; Bieringer, G.; Milasowszky, N.; Moser, D.; Plutzar, C.; Pollheimer, M.; Storch, C. et al.; Tröstl, R.; Zechmeister, H.; Grabherr, G.: Surrogate taxa for biodiversity in agricultural landscapes of eastern Austria. Biological Conservation 117, pp. 181 - 190 (2004)

Sæther, B. E.; Engen, S.; Møller, A. P.; Weimerskirch, H.; Visser, M. E.; Fiedler, W.; Matthysen, E.; Lambrechts, M. M.; Badyaev, A.; Becker, P. H. et al.; Brommer, J. E.; Bukacinski, D.; Bukacinska, M.; Christensen, H.; Dickinson, J.; du Feu, C.; Gehlbach, F. R.; Heg, D.; Hötker, H.; Merilä, J.; Nielsen, J. T.; Rendell, W.; Robertson, R. J.; Thomson, D. L.; Török, J.; van Hecke, P.: Life-history variation predicts the effects of demographic stochasticity on avian population dynamics. American Naturalist 164 (6), pp. 793 - 802 (2004)

Schäfer, T.: Video monitoring of shrub-nests reveals nest predators. Bird Study 51, pp. 170 - 177 (2004)

Schäfer, T.; Barkow, A.: Habitat and nest site preferences of Sylvia atricapilla and S-melanocephala in Majorca. Ardeola 51 (2), pp. 445 - 450 (2004)

Segelbacher, G.; Querner, U.; Fiedler, W.; Schmidt, A.; Berthold, P.: Capercaillie research in the Black Forest - combining radio tracking and genetic data. Grouse News 27, p. 12 (2004)

Segelbacher, G.; Storch, I.: Testing existing markers for studying genetic variability in Caucasian black grouse (Tetrao mlokosiewiczi) - A pilot study. Grouse News 28, pp. 12 - 13 (2004)

Soma, K. K.; Alday, N. A.; Hau, M.; Schlinger, B. A.: DHEA metabolism by 3ß-HSD in adult zebra finch brain: Sex difference and rapid effect of stress. Endocrinology 145 (4), pp. 1668 - 1677 (2004)

Streelman, J. T.; Gmyrek, S. L.; Kidd, M. R.; Kidd, C.; Robinson, R. L.; Hert, E.; Ambali, A. J.; Kocher, T. D.: Hybridization and contemporary evolution in an introduced cichlid fish from Lake Malawi National Park. Molecular Ecology 13, pp. 2471 - 2479 (2004)

Styrsky, J. D.; Berthold, P.; Robinson, W. D.: Endogenous control of migration and calendar effects in an intratropical migrant, the yellow-green vireo. Animal Behaviour 67 (6), pp. 1141 - 1149 (2004)

Suthers, R. A.; Zollinger, S. A.: Producing song: The vocal apparatus. Annals of the New York Academy of Sciences 1016, pp. 109 - 129 (2004)

Tebbich, S.; Bshary, R.: Cognitive abilities related to tool use in the woodpecker finch, Cactospiza pallida. Animal Behaviour 67 (4), pp. 689 - 697 (2004)

Tebbich, S.; Taborsky, M.; Fessl, B.; Dvorak, M.; Winkler, H.: Feeding behavior of four arboreal darwin's finches: Adaptations to spatial and seasonal variability. The Condor 106 (1), pp. 95 - 105 (2004)

Voigt, C.; Metzdorf, R.; Gahr, M.: Differential expression pattern and steroid hormone sensitivity of SNAP-25 and Synaptoporin mRNA in the telencephalic song control nucleus HVC of the zebra finch. The Journal of Comparative Neurology 475 (1), pp. 83 - 94 (2004)