1. Vigilance behaviour and fitness consequences: comparing a solitary foraging and an obligate group-foraging mammal

   • Aliza le Roux
   • Michael I. Cherry
   • Marta B. Manser

   Original Paper 05 May 2009 Pages: 1097 - 1107

   

2. Alternative mating tactics in the Italian treefrog, Hyla intermedia

   • Sergio Castellano
   • Valentina Marconi
   • Giulia Berto

   Original Paper 28 March 2009 Pages: 1109 - 1118

   

3. Specific targeting of host individuals by a kleptoparasitic bird

   • A. R. Ridley
   • M. F. Child

   Original Paper 05 May 2009 Pages: 1119 - 1126

   

4. Why do Horsfield’s bronze-cuckoo Chalcites basalis eggs mimic those of their hosts?

   • N. E. Langmore
   • R. M. Kilner

   Original Paper 25 March 2009 Pages: 1127 - 1131

5. The rarity of twins: a result of an evolutionary battle between mothers and daughters—or do they agree?

   • Gine Roll Skjærvø
   • Bård G. Stokke
   • Eivin Røskaft

   Original Paper 20 March 2009 Pages: 1133 - 1140

6. Disentangling the effects of group size and density on shoaling decisions of three-spined sticklebacks (Gasterosteus aculeatus)

   • Joachim G. Frommen
   • Meike Hiermes
   • Theo C. M. Bakker

   Original Paper 07 May 2009 Pages: 1141 - 1148

   

7. Differential aggressiveness between fire salamander (Salamandra infraimmaculata) larvae covaries with their genetic similarity

   • Shai Markman
   • Naomi Hill
   • Leon Blaustein

   Original Paper 28 April 2009 Pages: 1149 - 1155

   

8. Song amplitude and body size in birds

   • Henrik Brumm

   Original Paper Open access 13 March 2009 Pages: 1157 - 1165

   

9. Path selection and foraging efficiency in Argentine ant transport networks

   • Simon Garnier
   • Aurélie Guérécheau
   • Guy Theraulaz

   Original Paper 24 March 2009 Pages: 1167 - 1179

   

10. Spatiotemporal dynamics of habitat use by koalas: the checkerboard model

    • William A. H. Ellis
    • Alistair Melzer
    • Fred B. Bercovitch

    Original Paper 31 March 2009 Pages: 1181 - 1188

    

11. Kinship and aggression: do house sparrows spare their relatives?

    • Zoltán Tóth
    • Veronika Bókony
    • András Liker

    Original Paper 07 May 2009 Pages: 1189 - 1196

12. Geographic patterns of natal dispersal in barn swallows Hirundo rustica from Denmark and Spain

    • Javier Balbontín
    • Anders P. Møller
    • Florentino de Lope

    Original Paper 31 March 2009 Pages: 1197 - 1205

    

13. A population comparison of the strength and persistence of innate colour preference and learning speed in the bumblebee Bombus terrestris

    • Thomas C. Ings
    • Nigel E. Raine
    • Lars Chittka

    Original Paper 27 March 2009 Pages: 1207 - 1218

    

14. Sequential polyandry affords post-mating sexual selection in the mouths of cichlid females

    • Simone Immler
    • Michael Taborsky

    Original Paper 14 March 2009 Pages: 1219 - 1230

    

15. Studying shape in sexual signals: the case of primate sexual swellings

    • Elise Huchard
    • Julio A. Benavides
    • Michel Raymond

    Methods 31 March 2009 Pages: 1231 - 1242

    

16. Do the elongated eye stalks of Diopsid flies facilitate rival assessment?

    • Yoni Brandt
    • John G. Swallow

    Commentary 16 May 2009 Pages: 1243 - 1246