Seasonal anorexia in the male red-sided garter snake, Thamnophis sirtalis parietalis Ryan P. O’DonnellRichard ShineRobert T. Mason Original Article 03 June 2004 Pages: 413 - 419
Bigger testes do work more: experimental evidence that testis size reflects testicular cell proliferation activity in the marine invertebrate, the free-living flatworm Macrostomum sp. Lukas SchärerPeter LadurnerReinhard M. Rieger Original Article 26 May 2004 Pages: 420 - 425
Preferential incubation positions for different sized eggs and their influence on incubation period and hatching asynchrony in Snares crested (Eudyptes robustus) and yellow-eyed penguins (Megadyptes antipodes) Melanie MassaroLloyd S. Davis Original Article 26 May 2004 Pages: 426 - 434
Polarized short odor-trail recruitment communication by a stingless bee, Trigona spinipes James C. NiehFelipe A. L. ContreraVera L. Imperatriz-Fonseca Original Article 20 May 2004 Pages: 435 - 448
Sociality reduces individual direct fitness in a communally breeding rodent, the colonial tuco-tuco (Ctenomys sociabilis) Eileen A. Lacey Original Article 16 June 2004 Pages: 449 - 457
Sperm utilization pattern in the honeybee (Apis mellifera) Helge SchlünsGudrun KoenigerRobin F. A. Moritz Original Article 09 June 2004 Pages: 458 - 463
Ground gleaning in horseshoe bats: comparative evidence from Rhinolophus blasii, R. euryale and R. mehelyi Björn M. SiemersTeodora Ivanova Original Article 19 June 2004 Pages: 464 - 471
Extremely high mating frequency in the Florida harvester ant (Pogonomyrmex badius) Frank E. RheindtJürgen GadauBert Hölldobler Original Article 18 June 2004 Pages: 472 - 481
Experimentally elevated plasma levels of testosterone do not increase male reproductive success in blue tits Katharina FoersterBart Kempenaers Original Article 22 June 2004 Pages: 482 - 490
Yolk testosterone organizes behavior and male plumage coloration in house sparrows (Passer domesticus) Rosemary StrasserHubert Schwabl Original Paper 22 June 2004 Pages: 491 - 497
Group size and ectoparasitism affect daily survival probability in a colonial bird Charles R. BrownMary Bomberger Brown Original Article 08 July 2004 Pages: 498 - 511
Sperm utilization pattern in the honeybee (Apis mellifera) Helge SchlünsGudrun KoenigerRobin F. A. Moritz Erratum 25 June 2004 Pages: 512 - 512