1. Testosterone upregulates lipoprotein status to control sexual attractiveness in a colorful songbird

   • Kevin J. McGraw
   • Stephanie M. Correa
   • Elizabeth Adkins-Regan

   Original Article 23 December 2005 Pages: 117 - 122

   

2. Male mating speed promote hybridization in the Rana lessonae–Rana esculenta waterfrog system

   • T. Lengagne
   • O. Grolet
   • P. Joly

   Original Article 19 January 2006 Pages: 123 - 130

   

3. Offensive and defensive sperm competition roles in the dung beetle Onthophagus taurus (Coleoptera: Scarabaeidae)

   • Clarissa M. House
   • Leigh W. Simmons

   Original Article 04 February 2006 Pages: 131 - 136

   

4. Lactation patterns of pinnipeds are not explained by optimization of maternal energy delivery rates

   • Fritz Trillmich
   • Franz J. Weissing

   Original Article 07 February 2006 Pages: 137 - 149

   

5. Divergence in female calling song discrimination between sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae)

   • Yikweon Jang
   • H. Carl Gerhardt

   Original Article 01 February 2006 Pages: 150 - 158

   

6. Black spots and female association preferences in a sexual/asexual mating complex (Poecilia, Poeciliidae, Teleostei)

   • Michael Tobler
   • Martin Plath
   • Ingo Schlupp

   Original Article 01 March 2006 Pages: 159 - 165

   

7. Femoral secretions and copulatory plugs convey chemical information about male identity and dominance status in Iberian rock lizards (Lacerta monticola)

   • Pedro L. Moreira
   • Pilar López
   • José Martín

   Original Article 02 February 2006 Pages: 166 - 174

   

8. Resource quality or harem size: what influences male tenure at refuge sites in tree weta (Orthoptera: Anostostomatidae)?

   • Clint D. Kelly

   Original Article 15 March 2006 Pages: 175 - 183

   

9. Brood size manipulation affects frequency of second clutches in the blue tit

   • D. Parejo
   • E. Danchin

   Original Article 07 February 2006 Pages: 184 - 194

   

10. Determinants of predation risk in small wintering birds: the hawk’s perspective

    • Timothy C. Roth II
    • Steven L. Lima
    • William E. Vetter

    Original Article 02 February 2006 Pages: 195 - 204

    

11. Differentiated phenotypic plasticity in larvae of the cannibalistic salamander Hynobius retardatus

    • Hirofumi Michimae

    Original Article 01 February 2006 Pages: 205 - 211

    

12. Sperm allocation in relation to male traits, female size, and copulation behaviour in freshwater crayfish species

    • Diego Rubolini
    • Paolo Galeotti
    • Mauro Fasola

    Original Article 07 February 2006 Pages: 212 - 219

    

13. Differences in reproductive success between laboratory and wild-derived golden hamsters (Mesocricetus auratus) as a consequence of inbreeding

    • Peter Fritzsche
    • Karsten Neumann
    • Rolf Gattermann

    Original Article 01 March 2006 Pages: 220 - 226

    

14. Prey vulnerability in relation to sexual coloration of prey

    • Anders Pape Møller
    • Jan Tøttrup Nielsen

    Original Article 09 March 2006 Pages: 227 - 233

    

15. Bird song as a signal of aggressive intent

    • William A. Searcy
    • Rindy C. Anderson
    • Stephen Nowicki

    Original Article 24 February 2006 Pages: 234 - 241

    

16. Spatio-temporal use of the urban habitat by feral pigeons (Columba livia )

    • Eva Rose
    • Peter Nagel
    • Daniel Haag-Wackernagel

    Original Article 01 March 2006 Pages: 242 - 254

    

17. Evidence of obligate female promiscuity in a socially monogamous passerine

    • Frode Fossøy
    • Arild Johnsen
    • Jan T. Lifjeld

    Original Article 03 March 2006 Pages: 255 - 259

    

18. Heterospecific song matching in two closely related songbirds (Parus major and P. caeruleus): great tits match blue tits but not vice versa

    • Leen Gorissen
    • Marjan Gorissen
    • Marcel Eens

    Original Article 24 February 2006 Pages: 260 - 269

    

19. Among- and within-population variation in sperm quality in the simultaneously hermaphroditic land snail Arianta arbustorum

    • Nicole Minoretti
    • Bruno Baur

    Original Article 17 March 2006 Pages: 270 - 280

    

20. Food or sex—males and females in a sex role reversed pipefish have different interests

    • Anders Berglund
    • Gunilla Rosenqvist
    • Sarah Robinson-Wolrath

    Original Article 02 March 2006 Pages: 281 - 287