1. Policing in queenless ponerine ants

   • Thibaud Monnin
   • Francis L. Ratnieks

   Review Pages: 97 - 108

2. Colonial breeding and nest defence in Montagu's harrier (Circus pygargus)

   • Beatriz Arroyo
   • François Mougeot
   • Vincent Bretagnolle

   Original Article Pages: 109 - 115

3. Intransitive preferences in hoarding gray jays (Perisoreus canadensis)

   • Thomas A. Waite

   Original Article Pages: 116 - 121

4. Dart receipt promotes sperm storage in the garden snail Helix aspersa

   • David W. Rogers
   • Ronald Chase

   Original Article Pages: 122 - 127

5. Chemosensory discrimination of familiar and unfamiliar conspecifics by lizards: implications of field spatial relationships between males

   • Pedro Aragón
   • Pilar López
   • José Martín

   Original Article Pages: 128 - 133

6. Correlates of group size in a cooperatively breeding cichlid fish (Neolamprologus pulcher)

   • Sigal Balshine
   • Brenda Leach
   • Noam Werner

   Original Article Pages: 134 - 140

7. Nest-maintenance effort and health status in chinstrap penguins, Pygoscelis antarctica: the functional significance of stone-provisioning behaviour

   • Juan A. Fargallo
   • Ana De León
   • Jaime Potti

   Original Article Pages: 141 - 150

8. A fully reproductive fighting morph in a soldier clade of gall-inducing thrips (Oncothrips morrisi)

   • Brenda D. Kranz
   • Michael P. Schwarz
   • Bernard J. Crespi

   Original Article Pages: 151 - 161

9. Field-testing the protandry-based mating system for the lizard, Anolis carolinesis: does the model organism have the right model?

   • Thomas A. Jenssen
   • Matthew B. Lovern
   • Justin D. Congdon

   Original Article Pages: 162 - 172

10. Discrimination between related and unrelated individuals in the Australian lizard Egernia striolata

    • Michael C. Bull
    • Clare L. Griffin
    • Steven J. Cooper

    Original Article Pages: 173 - 179

11. Heart rate changes reveal that little blue penguin chicks (Eudyptula minor) can use vocal signatures to discriminate familiar from unfamiliar chicks

    • Shinichi Nakagawa
    • Joseph R. Waas
    • Masamine Miyazaki

    Original article Pages: 180 - 188

12. Alternative reproductive tactics in the queen-size-dimorphic ant Leptothorax rugatulus (Emery) and their consequences for genetic population structure

    • O. Rüppell
    • J. Heinze
    • B. Hölldobler

    Original Article Pages: 189 - 197