Why are males bigger than females in pre-copula pairs of Gammarus pulex? Jonathan AdamsPaul J. Greenwood OriginalPaper Pages: 239 - 241
Responses to sugars and their behavioural mechanisms in the starling (Sturnus vulgaris L.) Werner Schuler OriginalPaper Pages: 243 - 251
The foraging ecology of hoverflies (Diptera, Syrphidae): circular movements on composite flowers Francis S. Gilbert OriginalPaper Pages: 253 - 257
Vocal learning in White-crowned Sparrows: sensitive phase and song dialects Michael A. CunninghamMyron Charles Baker OriginalPaper Pages: 259 - 269
Extra-pair copulations in the Pied Flycatcher (Ficedula hypoleuca) Mats BjörklundBjörn Westman OriginalPaper Pages: 271 - 275
Responses of pikas (Ochotona princeps, Lagomorpha) to naturally occurring terrestrial predators Barbara L. IvinsAndrew T. Smith OriginalPaper Pages: 277 - 285
Echolocation, development, and vocal communication in the lesser bulldog bat, Noctilio albiventris Patricia E. BrownTimothy W. BrownAlan D. Grinnell OriginalPaper Pages: 287 - 298
The mechanism of nestmate discrimination in social wasps (Polistes, Hymenoptera: Vespidae) David W. PfennigGeorge J. GamboaI. Deanna Ferguson OriginalPaper Pages: 299 - 305
The influence of the ambient sex ratio and intermale competition on the sexual behavior of the red-spotted newt, Notophthalmus viridescens (Amphibia: Urodela: Salamandridae) Paul A. Verrell OriginalPaper Pages: 307 - 313