How a songbird with a continuous singing style modulates its song when territorially challenged Nicole GeberzahnThierry Aubin Original Paper Open access 18 August 2013 Pages: 1 - 12
Preferences and tradeoffs in nectar temperature and nectar concentration in the Asian hive bee Apis cerana Ken TanTanya LattyBenjamin P. Oldroyd Original Paper 15 August 2013 Pages: 13 - 20
Behavioral transitions with the evolution of cooperative nest founding by harvester ant queens Rick OversonJuergen GadauJennifer H. Fewell Original Paper 20 August 2013 Pages: 21 - 30
Different escape tactics of two vole species affect the success of the hunting predator, the least weasel S. MäkeläinenL. TrebatickáH. Ylönen Original Paper 13 September 2013 Pages: 31 - 40
The role of per-capita productivity in the evolution of small colony sizes in ants Boris H. KramerInon ScharfSusanne Foitzik Original Paper 13 September 2013 Pages: 41 - 53
Do leaf-cutter ants Atta colombica obtain their magnetic sensors from soil? Andre J. RiverosDarci M. S. EsquivelRobert B. Srygley Original Paper 30 August 2013 Pages: 55 - 62
Ultraviolet reflectance influences female preference for colourful males in the European serin Ana V. LeitãoAnabela H. MonteiroPaulo G. Mota Original Paper 13 September 2013 Pages: 63 - 72
Delayed juvenile dispersal and monogamy, but no cooperative breeding in white-breasted mesites (Mesitornis variegata) Anna GameroTamás SzékelyPeter M. Kappeler Original Paper 12 September 2013 Pages: 73 - 83
Strong responsiveness to noise interference in an anuran from the southern temperate forest Mario PennaDaniel Zúñiga Original Paper 08 September 2013 Pages: 85 - 97
“Armpit effect” in an African cichlid fish: self-referent kin recognition in mating decisions of male Pelvicachromis taeniatus Timo ThünkenTheo C. M. BakkerSebastian A. Baldauf Original Paper 15 September 2013 Pages: 99 - 104
Consequences of resource competition for sex allocation and discriminative behaviors in a hyperparasitoid wasp Bertanne VisserCécile Le LannJeffrey A. Harvey Original Paper 13 September 2013 Pages: 105 - 113
Age-dependent effects of carotenoids on sexual ornaments and reproductive performance of a long-lived seabird René Beamonte-BarrientosAlberto VelandoRoxana Torres Original Paper 08 September 2013 Pages: 115 - 126
Background level of risk determines the intensity of predator neophobia in juvenile convict cichlids Grant E. BrownDouglas P. ChiversMaud C. O. Ferrari Original Paper 08 September 2013 Pages: 127 - 133
Effects of remarriage after widowhood on long-term fitness in a monogamous historical human population Jenni E PettayAnna RotkirchVirpi Lummaa Original Paper 08 October 2013 Pages: 135 - 143
A test of multiple hypotheses for the function of call sharing in female budgerigars, Melopsittacus undulatus Christine R. DahlinAnna M. YoungTimothy F. Wright Original Paper 25 September 2013 Pages: 145 - 161
Transitioning from unstable to stable colony growth in the desert leafcutter ant Acromyrmex versicolor Rebecca M. ClarkJennifer H. Fewell Original Paper 22 September 2013 Pages: 163 - 171