1. Age-related foetal sex ratio bias in Iberian red deer (Cervus elaphus hispanicus): are male calves too expensive for growing mothers?

   • Tomás Landete-Castillejos
   • Christian Gortázar
   • Laureano Gallego

   Original Article 13 February 2004 Pages: 1 - 8

   

2. Division of labor and the evolution of task sharing in queen associations of the harvester ant Pogonomyrmex californicus

   • Sara Helms Cahan
   • Jennifer H. Fewell

   Original Article 13 February 2004 Pages: 9 - 17

   

3. Factors affecting vigilance within wild mixed-species troops of saddleback (Saguinus fuscicollis) and moustached tamarins (S. mystax)

   • Andrew C. Smith
   • Shaleyla Kelez
   • Hannah M. Buchanan-Smith

   Original Article 22 January 2004 Pages: 18 - 25

   

4. How Kentish plovers, Charadrius alexandrinus, cope with heat stress during incubation

   • Juan A. Amat
   • José A. Masero

   Original Article 04 February 2004 Pages: 26 - 33

   

5. Male-male interference competition decreases spawning rate in the European bitterling (Rhodeus sericeus)

   • Martin Reichard
   • Pavel Jurajda
   • Carl Smith

   Original Article 10 February 2004 Pages: 34 - 41

   

6. Differential reproductive success among subfamilies in queenless honeybee (Apis mellifera L.) colonies

   • Caroline G. Martin
   • Benjamin P. Oldroyd
   • Madeleine Beekman

   Original Article 10 February 2004 Pages: 42 - 49

   

7. Multiple paternity and colony homeostasis in Lasius niger ants

   • Else J. Fjerdingstad

   Original Article 10 February 2004 Pages: 50 - 58

8. Female courtship in the Banggai cardinalfish: honest signals of egg maturity and reproductive output?

   • Niclas Kolm

   Original Article 27 January 2004 Pages: 59 - 64

   

9. Sperm swimming speed and energetics vary with sperm competition risk in bluegill (Lepomis macrochirus)

   • Gary Burness
   • Stephen J. Casselman
   • Robert Montgomerie

   Original Article 23 January 2004 Pages: 65 - 70

   

10. Functional reference in an alarm signal given during nest defence: seet calls of yellow warblers denote brood-parasitic brown-headed cowbirds

    • Sharon A. Gill
    • Spencer G. Sealy

    Original Article 30 January 2004 Pages: 71 - 80

    

11. Brood neglect and contingent foraging behavior in a pelagic seabird

    • Sue Lewis
    • Keith C. Hamer
    • Thomas N. Sherratt

    Original Article 13 February 2004 Pages: 81 - 88

    

12. Help or disperse? Cooperation in termites influenced by food conditions

    • Judith Korb
    • Sandra Schmidinger

    Original Article 31 January 2004 Pages: 89 - 95