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Goymann, W.; Moore, I. T.; Scheuerlein, A.; Hirschenhauser, K.; Grafen, A.; Wingfield, J. C.: Testosterone in tropical birds: Effects of environmental and social factors. American Naturalist 164 (3), pp. 327 - 334 (2004)

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Goymann, W.; Wingfield, J. C.: Allostatic load, social status and stress hormones: The costs of social status matter. Animal Behaviour 67 (3), pp. 591 - 602 (2004)

Goymann, W.; Wittenzellner, A.; Wingfield, J. C.: Competing females and caring males. Polyandry and sex-role reversal in African black coucals, Centropus grillii. Ethology 110 (10), pp. 807 - 823 (2004)

Grosch, K.: Hybridization between redstart Phoenicurus phoenicurus and black redstart P. ochruros, and the effect on habitat exploitation. Journal of Avian Biology 35 (3), pp. 217 - 223 (2004)

Grutter, A. S.; Bshary, R.: Cleaner fish, Labroides dimidiatus, diet preferences for different types of mucus and parasitic gnathiid isopods. Animal Behaviour 68 (3), pp. 583 - 588 (2004)

Guicking, D.; Fiedler, W.; Leuther, C.; Schlatter, R.; Becker, P. H.: Morphometrics of the pink-footed shearwater (Puffinus creatopus): Influence of sex and breeding site. Journal of Ornithology 145 (1), pp. 64 - 68 (2004)

Gwinner, E.: Life´s daily beat. Review: Rhythms of Life (R. G. Foster and L. Kreitzman). Science 304 (5679), pp. 1906 - 1907 (2004)

Hau, M.; Dominguez, O. A.; Evrard, H. C.: Testosterone reduces responsiveness to nociceptive stimuli in a wild bird. Hormones and Behavior 46 (2), pp. 165 - 170 (2004)

Hau, M.; Stoddard, S. T.; Soma, K. K.: Territorial aggression in a tropical bird: Hormone-behavior interactions in the non-breeding season. Hormones and Behavior 45 (1), pp. 40 - 49 (2004)

Hau, M.; Wikelski, M.; Gwinner, H.; Gwinner, E.: Timing of reproduction in a Darwin's finch: Temporal opportunism under spatial constraints. Oikos 106 (3), pp. 489 - 500 (2004)

Jimenez, C. R.; Ter Maat, A.; Pieneman, A.; Burlingame, A. L.; Smit, A. B.; Li, K. W.: Spatio-temporal dynamics of the egg-laying-inducing peptides during an egg-laying cycle: A semiquantitative matrix-assisted laser desorption/ionization mass spectrometry approach. Journal of Neurochemistry 89 (4), pp. 865 - 875 (2004)

Kaiser, A.; Berthold, P.: A european example of standardized mist netting in population studies of birds. Studies in Avian Biology 29, pp. 75 - 81 (2004)

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Kaissling, K.-E.; Rospars, J. P.: Dose-response relationships in an olfactory flux detector model revisited. Chemical Senses 29 (6), pp. 529 - 531 (2004)

Klaassen, M.; Oltrogge, M.; Trost, L.: Basal metabolic rate, food intake, and body mass in cold- and warm-acclimated Garden Warblers. Comparative Biochemistry and Physiology A-Molecular & Integrative Physiology 137 (4), pp. 639 - 647 (2004)

Korner-Nievergelt, F.; Leisler, B.: Morphological convergence in conifer-dwelling passerines. Journal of Ornithology 145 (3), pp. 245 - 255 (2004)

Korstjens, A. H.; Noe, R.: Mating system of an exceptional primate, the olive colobus (Procolobus verus). American Journal of Primatology 62 (4), pp. 261 - 273 (2004)