1. When females should contest for food – testing hypotheses about resource density, distribution, size, and quality with Hanuman langurs (Presbytis entellus)

   • Andreas Koenig
   • Jan Beise
   • Jörg U. Ganzhorn

   ORIGINAL ARTICLES Pages: 225 - 237

2. Male competition in Cardiocondyla ants

   • J. Heinze
   • B. Hölldobler
   • K. Yamauchi

   Article Pages: 239 - 246

3. Sperm usage in honey bees

   • Michael Haberl
   • Diethard Tautz

   Article Pages: 247 - 255

4. Multiple mating increases the sperm stores of Atta colombica leafcutter ant queens

   • Else J. Fjerdingstad
   • Jacobus J. Boomsma

   Article Pages: 257 - 261

5. Chemically mediated avoidance of a predatory odonate (Anaxjunius) by American toad (Bufoamericanus) and wood frog (Ranasylvatica) tadpoles

   • James Petranka
   • Laura Hayes

   Article Pages: 263 - 271

6. Costs of brood parasitism and the lack of defenses on the yellow-winged blackbird - shiny cowbird system

   • Viviana Massoni
   • Juan Carlos Reboreda

   Article Pages: 273 - 280

7. Cluttered habitats reduce wing asymmetry and increase flight performance in European starlings

   • John P. Swaddle
   • Mark S. Witter

   Article Pages: 281 - 287

8. The role of daytime cues in the development of magnetic orientation in a night-migrating bird

   • Peter Weindler
   • Frank Böhme
   • Wolfgang Wiltschko

   Article Pages: 289 - 294