1. The social behavior of Leptothorax allardycei (Hymenoptera, Formicidae): time budgets and the evolution of worker reproduction

   • Blaine J. Cole

   OriginalPaper Pages: 165 - 173

2. Group size and foraging efficiency in yellow baboons

   • Peter B. Stacey

   OriginalPaper Pages: 175 - 187

3. Acoustic communication in phaneropterid bushcrickets: species-specific delay of female stridulatory response and matching male sensory time window

   • Klaus-Gerhard Heller
   • Dagmar von Helversen

   OriginalPaper Pages: 189 - 198

4. Equality of feeding roles and the maintenance of monogamy in tree swallows

   • David Leffelaar
   • Raleigh J. Robertson

   OriginalPaper Pages: 199 - 206

5. Sound and vibrational signals in the dance language of the honeybee, Apis mellifera

   • Axel Michelsen
   • Wolfgang H. Kirchner
   • Martin Lindauer

   OriginalPaper Pages: 207 - 212

6. Radiotelemetric monitoring of heart-rate responses to song playback in blackbirds (Turdus merula)

   • Peter Diehl
   • Hans-Wolfgang Helb

   OriginalPaper Pages: 213 - 219

7. Communication by changing signals: call switching in red-winged blackbirds

   • L. David Beletsky
   • B. J. Higgins
   • Gordon H. Orians

   OriginalPaper Pages: 221 - 229

8. Resource distribution, aggressive asymmetries and variable access to resources in the nectar feeding bellbird

   • John L. Craig
   • Murray E. Douglas

   OriginalPaper Pages: 231 - 240