Vigilance behaviour and fitness consequences: comparing a solitary foraging and an obligate group-foraging mammal Aliza le RouxMichael I. CherryMarta B. Manser Original Paper 05 May 2009 Pages: 1097 - 1107
Alternative mating tactics in the Italian treefrog, Hyla intermedia Sergio CastellanoValentina MarconiGiulia Berto Original Paper 28 March 2009 Pages: 1109 - 1118
Specific targeting of host individuals by a kleptoparasitic bird A. R. RidleyM. F. Child Original Paper 05 May 2009 Pages: 1119 - 1126
Why do Horsfield’s bronze-cuckoo Chalcites basalis eggs mimic those of their hosts? N. E. LangmoreR. M. Kilner Original Paper 25 March 2009 Pages: 1127 - 1131
The rarity of twins: a result of an evolutionary battle between mothers and daughters—or do they agree? Gine Roll SkjærvøBård G. StokkeEivin Røskaft Original Paper 20 March 2009 Pages: 1133 - 1140
Disentangling the effects of group size and density on shoaling decisions of three-spined sticklebacks (Gasterosteus aculeatus) Joachim G. FrommenMeike HiermesTheo C. M. Bakker Original Paper 07 May 2009 Pages: 1141 - 1148
Differential aggressiveness between fire salamander (Salamandra infraimmaculata) larvae covaries with their genetic similarity Shai MarkmanNaomi HillLeon Blaustein Original Paper 28 April 2009 Pages: 1149 - 1155
Song amplitude and body size in birds Henrik Brumm Original Paper Open access 13 March 2009 Pages: 1157 - 1165
Path selection and foraging efficiency in Argentine ant transport networks Simon GarnierAurélie GuérécheauGuy Theraulaz Original Paper 24 March 2009 Pages: 1167 - 1179
Spatiotemporal dynamics of habitat use by koalas: the checkerboard model William A. H. EllisAlistair MelzerFred B. Bercovitch Original Paper 31 March 2009 Pages: 1181 - 1188
Kinship and aggression: do house sparrows spare their relatives? Zoltán TóthVeronika BókonyAndrás Liker Original Paper 07 May 2009 Pages: 1189 - 1196
Geographic patterns of natal dispersal in barn swallows Hirundo rustica from Denmark and Spain Javier BalbontínAnders P. MøllerFlorentino de Lope Original Paper 31 March 2009 Pages: 1197 - 1205
A population comparison of the strength and persistence of innate colour preference and learning speed in the bumblebee Bombus terrestris Thomas C. IngsNigel E. RaineLars Chittka Original Paper 27 March 2009 Pages: 1207 - 1218
Sequential polyandry affords post-mating sexual selection in the mouths of cichlid females Simone ImmlerMichael Taborsky Original Paper 14 March 2009 Pages: 1219 - 1230
Studying shape in sexual signals: the case of primate sexual swellings Elise HuchardJulio A. BenavidesMichel Raymond Methods 31 March 2009 Pages: 1231 - 1242
Do the elongated eye stalks of Diopsid flies facilitate rival assessment? Yoni BrandtJohn G. Swallow Commentary 16 May 2009 Pages: 1243 - 1246