1. Evidence of equal maternal investment in the sexes in the polygynous and sexually dimorphic grey seal (Halichoerus grypus)

   • Per T. Smiseth
   • Svein-Håkon Lorentsen

   OriginalPaper Pages: 145 - 150

2. Testosterone-induced depression of male parental behavior in the barn swallow: female compensation and effects on seasonal fitness

   • N. Saino
   • A. P. Møller

   OriginalPaper Pages: 151 - 157

3. The reproductive behavior and energetics of male gray seals (Halichoerus grypus) breeding on a land-fast ice substrate

   • M. Tim Tinker
   • Kit M. Kovacs
   • Mike O. Hammill

   OriginalPaper Pages: 159 - 170

4. Sex difference in signature whistle production of free-ranging bottlenose dolphins, Tursiops truncates

   • Laela S. Sayigh
   • Peter L. Tyack
   • A. Blair Irvine

   OriginalPaper Pages: 171 - 177

5. Female choice on male quantitative traits in lizards — why is it so rare?

   • Mats Olsson
   • Thomas Madsen

   OriginalPaper Pages: 179 - 184

6. Pillar building in the fiddler crab Uca beebei: evidence for a condition-dependent ornament

   • Patricia R.Y. Backwell
   • Michael D. Jennions
   • Ursula Schober

   OriginalPaper Pages: 185 - 192

7. Past reproductive effort affects parental behaviour in a cichlid fish, Cichlasoma nigrofasciatum: a comparison of inexperienced and experienced breeders with normal and experimentally reduced broods

   • Robert J. Lavery
   • Robert J. Laveryl

   OriginalPaper Pages: 193 - 199

8. Does the great spotted cuckoo choose magpie hosts according to their parenting ability?

   • Juan José Soler
   • Manuel Soler
   • Juan Gabriel Martínez

   OriginalPaper Pages: 201 - 206

9. Flexible bat echolocation: the influence of individual, habitat and conspecifics on sonar signal design

   • Martin K. Obrist

   OriginalPaper Pages: 207 - 219