1. The evolution of empty nuptial gifts in a dance fly, Empis snoddyi (Diptera: Empididae): bigger isn't always better

   • Jennifer A. Sadowski
   • Allen J. Moore
   • Edmund D. Brodie III

   ORIGINAL ARTICLE Pages: 161 - 166

2. Is avian humoral immunocompetence suppressed by testosterone?

   • Dennis Hasselquist
   • James A. Marsh
   • John C. Wingfield

   ORIGINAL ARTICLE Pages: 167 - 175

3. Size assessment in simulated territorial encounters between male green frogs (Rana clamitans)

   • Mark A. Bee
   • Stephen A. Perrill
   • Patrick C. Owen

   ORIGINAL ARTICLE Pages: 177 - 184

4. Positive association of queen number and queen-mating frequency Myrmica ants: a challenge to the genetic-variability hypotheses

   • Jes S. Pedersen
   • Jacobus J. Boomsma

   ORIGINAL ARTICLE Pages: 185 - 193

5. Ecological relevance of associative learning in fruit fly larvae

   • Reuven Dukas

   ORIGINAL ARTICLE Pages: 195 - 200

6. Replacement males in the western bluebird: opportunity for paternity, chick-feeding rules, and fitness consequences of male parental care

   • Janis L. Dickinson
   • Wesley W. Weathers

   ORIGINAL ARTICLE Pages: 201 - 209

7. Breeding synchrony and paternity in the barn swallow (Hirundo rustica)

   • N. Saino
   • C. R. Primmer
   • A. P. Møller

   ORIGINAL ARTICLE Pages: 211 - 218

8. Tropical arboreal ant mosaics: innate attraction and imprinting determine nest site selection in dominant ants

   • Champlain Djieto-Lordon
   • Alain Dejean

   ORIGINAL ARTICLE Pages: 219 - 225

9. Regulation of pollen foraging in honeybee colonies: effects of young brood, stored pollen, and empty space

   • Claudia Dreller
   • Robert E. Page Jr.
   • M. Kim Fondrk

   ORIGINAL ARTICLE Pages: 227 - 233

10. Effects of male dominance and courtship display on female choice in the ring-necked pheasant

    • Concha Mateos
    • Juan Carranza

    ORIGINAL ARTICLE Pages: 235 - 244

11. Variance in female quality, operational sex ratio and male mate choice in a bushcricket

    • Charlotta Kvarnemo
    • Leigh W. Simmons

    ORIGINAL ARTICLE Pages: 245 - 252

12. Mate choice among sympatric fur seals: female preference for conphenotypic males

    • S. D. Goldsworthy
    • D. J. Boness
    • R. C. Fleischer

    ORIGINAL ARTICLE Pages: 253 - 267

13. Evolution of extreme polyandry in the honeybee Apis mellifera L.

    • S. Fuchs
    • R. F. A. Moritz

    ORIGINAL ARTICLE Pages: 269 - 275

14. Imperfect female choice and male mating skew on leks of different sizes

    • Rufus A. Johnstone
    • David J. D. Earn

    ORIGINAL ARTICLE Pages: 277 - 281

15. Multiple paternity in meadow voles (Microtus pennsylvanicus): investigating the role of the female

    • Dominique Berteaux
    • Joël Bêty
    • Jean-Marie Bergeron

    ORIGINAL ARTICLE Pages: 283 - 291

16. Paternal investment in Poecilimon veluchianus bushcrickets: beneficial effects of nuptial feeding on offspring viability

    • Klaus Reinhold

    ORIGINAL ARTICLE Pages: 293 - 299

17. Task selection by workers of the fire ant Solenopsis invicta

    • Deby Lee Cassill
    • Walter R. Tschinkel

    ORIGINAL ARTICLE Pages: 301 - 310

18. Time budgets and foraging in a Malagasy primate: do sex differences reflect reproductive condition and female dominance?

    • Claire A. Hemingway

    ORIGINAL ARTICLE Pages: 311 - 322