1. Foraging costs of a tail ornament: Experimental evidence from two populations of barn swallows Hirundo rustica with different degrees of sexual size dimorphism

   • A. P. Moller
   • F. de Lope
   • J. M. López Caballero

   OriginalPaper Pages: 289 - 295

2. Vibrational communication between hitchhikers and foragers in leaf-cutting ants (Atta cephalotes)

   • Flavio Roces
   • Bert Hölldobler

   OriginalPaper Pages: 297 - 302

3. Assessment and individual recognition of opponents in the pygmy swordtails Xiphophorus nigrensis and X. multilineatus

   • Molly R. Morris
   • Leila Gass
   • Michael J. Ryan

   OriginalPaper Pages: 303 - 310

4. Is sex-biased maternal care limited by total maternal expenditure in polygynous ungulates?

   • Christophe Pélabon
   • Jean-Michel Gaillard
   • Christine Portier

   OriginalPaper Pages: 311 - 319

5. Echolocation call design and limits on prey size: a case study using the aerial-hawking bat Nyctalus leisleri

   • Dean A. Waters
   • Jens Rydell
   • Gareth Jones

   OriginalPaper Pages: 321 - 328

6. Levels of polyandry and intracolonial genetic relationships in Apis florea

   • Benjamin P. Oldroyd
   • Adam J. Smolenski
   • Ross H. Crozier

   OriginalPaper Pages: 329 - 335

7. Does cadence of Iguana iguana displays facilitate individual recognition?

   • John A. Phillips

   OriginalPaper Pages: 337 - 342

8. Why are larger convict cichlid (Cichlasoma nigrofasciatum) fry sometimes adopted into broods of smaller fry?

   • Shannon A. Fraser
   • Miles H. A. Keenleyside

   OriginalPaper Pages: 343 - 347

9. Within-brood patterns of paternity and paternal behavior in red-winged blackbirds

   • David F. Westneat
   • Anne B. Clark
   • D. F. Westneat

   OriginalPaper Pages: 349 - 356

10. High degree of polyandry in Apis dorsata queens detected by DNA microsatellite variability

    • Robin F. A. Moritz
    • Per Kryger
    • Salim Tingek

    OriginalPaper Pages: 357 - 363