Mate choice and fitness in a hybrid frog: Rana esculenta females prefer Rana lessonae males over their own Gaby AbtHeinz-Ulrich Reyer OriginalPaper Pages: 221 - 228
The cost of parental care and egg cannibalism in the river bullhead, Cottus gobio L. (Pisces, Cottidae) A. MarconatoA. BisazzaM. Fabris OriginalPaper Pages: 229 - 237
Mating effort or paternal investment? Incorporation rate and cost of male donations in the wartbiter Nina Wedell OriginalPaper Pages: 239 - 246
The sociality of Xylocopa pubescens: does a helper really help? Katja HogendoornHayo H. W. Velthuis OriginalPaper Pages: 247 - 257
Ontogeny of dispersal distances in young Spanish imperial eagles M. Ferrer OriginalPaper Pages: 259 - 263
The regulation of pollen foraging by honey bees: how foragers assess the colony's need for pollen Scott Camazine OriginalPaper Pages: 265 - 272
Baboons adjust secondary sex ratio in response to predictors of sex-specific offspring survival Samuel K. WasserGuy Norton OriginalPaper Pages: 273 - 281
Male reproductive success in two midwife toads, Alytes obstetricans and A. cisternasii Rafael Márquez OriginalPaper Pages: 283 - 291