Colonial breeding and nest defence in Montagu's harrier (Circus pygargus) Beatriz ArroyoFrançois MougeotVincent Bretagnolle Original Article Pages: 109 - 115
Intransitive preferences in hoarding gray jays (Perisoreus canadensis) Thomas A. Waite Original Article Pages: 116 - 121
Dart receipt promotes sperm storage in the garden snail Helix aspersa David W. RogersRonald Chase Original Article Pages: 122 - 127
Chemosensory discrimination of familiar and unfamiliar conspecifics by lizards: implications of field spatial relationships between males Pedro AragónPilar LópezJosé Martín Original Article Pages: 128 - 133
Correlates of group size in a cooperatively breeding cichlid fish (Neolamprologus pulcher) Sigal BalshineBrenda LeachNoam Werner Original Article Pages: 134 - 140
Nest-maintenance effort and health status in chinstrap penguins, Pygoscelis antarctica: the functional significance of stone-provisioning behaviour Juan A. FargalloAna De LeónJaime Potti Original Article Pages: 141 - 150
A fully reproductive fighting morph in a soldier clade of gall-inducing thrips (Oncothrips morrisi) Brenda D. KranzMichael P. SchwarzBernard J. Crespi Original Article Pages: 151 - 161
Field-testing the protandry-based mating system for the lizard, Anolis carolinesis: does the model organism have the right model? Thomas A. JenssenMatthew B. LovernJustin D. Congdon Original Article Pages: 162 - 172
Discrimination between related and unrelated individuals in the Australian lizard Egernia striolata Michael C. BullClare L. GriffinSteven J. Cooper Original Article Pages: 173 - 179
Heart rate changes reveal that little blue penguin chicks (Eudyptula minor) can use vocal signatures to discriminate familiar from unfamiliar chicks Shinichi NakagawaJoseph R. WaasMasamine Miyazaki Original article Pages: 180 - 188
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