Opposing selective pressures on hatching asynchrony: egg viability, brood reduction, and nestling growth J. Viñuela Original Article Pages: 333 - 343
Aggression and resource sharing among foundresses in the social wasp Polistes dominulus: testing transactional theories of conflict E. A. TibbettsH. K. Reeve Original Article Pages: 344 - 352
Sexual dimorphism in house sparrow eggs P. J. CorderoS. C. GriffithD. T. Parkin Original Article Pages: 353 - 357
Song type variants and aggressive context W. A. SearcyS. NowickiC. Hogan Original Article Pages: 358 - 363
Assessing the aerodynamic effects of tail elongations in the house martin (Delichon urbica): implications for the initial selection pressures in hirundines K. J. ParkM. R. EvansK. L. Buchanan Original Article Pages: 364 - 372
Habitat preference increases territorial defence in brown trout (Salmo trutta) J. I. JohnssonM. CarlssonL. F. Sundström Original Article Pages: 373 - 377
The influence of potential reproductive rate and variation in mate quality on male and female choosiness in the sand goby, Pomatoschistus minutus C. KvarnemoE. Forsgren Original Article Pages: 378 - 384
Kin recognition in rainbowfish (Melanotaenia eachamensis): sex, sibs and shoaling K. E. Arnold Original Article Pages: 385 - 391
Opportunistic discrimination of alien eggs by social wasps (Polistes biglumis, Hymenoptera Vespidae): a defense against social parasitism? M. C. LorenziF. Filippone Original Article Pages: 402 - 406
Testosterone and the allocation of reproductive effort in male house finches (Carpodacus mexicanus) A. M. StoehrG. E. Hill Original Article Pages: 407 - 411