Division of labor in honeybees: form, function, and proximate mechanisms Brian R. Johnson Review Open access 10 November 2009 Pages: 305 - 316
Egg-spot pattern rather than egg colour affects conspecific egg rejection in the house sparrow (Passer domesticus) M. Dolores G. López-de-HierroGregorio Moreno-Rueda Original Paper 23 June 2009 Pages: 317 - 324
Vigilance of mustached tamarins in single-species and mixed-species groups—the influence of group composition Mojca Stojan-DolarEckhard W. Heymann Original Paper Open access 25 September 2009 Pages: 325 - 335
Conditional sex allocation in the Red Mason bee, Osmia rufa Karsten SeidelmannKarin UlbrichNorbert Mielenz Original Paper 18 September 2009 Pages: 337 - 347
Acquisition of fission–fusion social organization in a chimpanzee (Pan troglodytes troglodytes) community released into the wild Yann Le HellayeBenoît GoossensDeborah J. Curtis Original Paper 26 September 2009 Pages: 349 - 360
Effect of losing on male fights of broad-horned flour beetle, Gnatocerus cornutus Kensuke OkadaTakahisa Miyatake Original Paper 16 September 2009 Pages: 361 - 369
Secondary sex ratios do not support maternal manipulation: extensive data from laboratory colonies of spiny mice (Muridae: Acomys) Marcela NovákováBarbora VašákováDaniel Frynta Original Paper 06 October 2009 Pages: 371 - 379
Bold minnows consistently approach danger in the field and lab in response to either chemical or visual indicators of predation risk Adam F. A. PellegriniBrian D. WisendenPeter W. Sorensen Original Paper 23 September 2009 Pages: 381 - 387
Kleptoparasites: a twofold cost of group living for the colonial spider, Metepeira incrassata (Araneae, Araneidae) Andrea T. McCrateGeorge W. Uetz Original Paper 18 September 2009 Pages: 389 - 399
Male and female developmental differences in chemosensory investigations by African elephants (Loxodonta africana) approaching waterholes Christen E. MerteThomas E. GoodwinBruce A. Schulte Original Paper 18 September 2009 Pages: 401 - 408
Habitat-related birdsong divergence: a multi-level study on the influence of territory density and ambient noise in European blackbirds Erwin A. P. RipmeesterJet S. KokHans Slabbekoorn Original Paper Open access 30 September 2009 Pages: 409 - 418
Worker reproductive parasitism and drift in the western honeybee Apis mellifera Nadine C. ChapmanMadeleine BeekmanBenjamin P. Oldroyd Original Paper 18 September 2009 Pages: 419 - 427
Intratree vertical variation of fruit density and the nature of contest competition in frugivores Alain HouleColin A. ChapmanWilliam L. Vickery Original Paper 06 October 2009 Pages: 429 - 441
How unpredictable is the individual scanning process in socially foraging mammals? Olivier PaysSimon P. BlombergPeter J. Jarman Original Paper 24 September 2009 Pages: 443 - 454
Carotenoid-rich mouth colors influence the conspicuousness of nestling birds Matthew B. DugasGil G. Rosenthal Original Paper 03 October 2009 Pages: 455 - 462
Extra-pair paternity in eastern bluebirds: effects of manipulated density and natural patterns of breeding synchrony Sarah L. M. StewartDavid F. WestneatGary Ritchison Original Paper 30 September 2009 Pages: 463 - 473
Family structure and variation in reproductive success in blackbirds Scott Forbes Original Paper 02 October 2009 Pages: 475 - 483
How do weaponless male fiddler crabs avoid aggression? Isobel BooksmytheRichard N. C. MilnerPatricia R. Y. Backwell Original Paper 03 October 2009 Pages: 485 - 491
Sampling animal association networks with the gambit of the group Daniel W. FranksGraeme D. RuxtonRichard James Methods 17 October 2009 Pages: 493 - 503