1. Structure and evolution of song form in the wrens Thryothorus sinaloa and T. felix

   • R. Neil Brown
   • R. E. Lemon

   OriginalPaper Pages: 111 - 131

2. Behavioral ecology of alpine yellow-bellied marmots

   • Dennis W. Johns
   • Kenneth B. Armitage

   OriginalPaper Pages: 133 - 157

3. Interspecific territoriality in red-breasted meadowlarks and a method for estimating the mutuality of their participation

   • Michael Gochfeld

   OriginalPaper Pages: 159 - 170

4. Parental care and mating system of the prairie vole, Microtus ochrogaster

   • Jeanette A. Thomas
   • Elmer C. Birney

   OriginalPaper Pages: 171 - 186

5. Insect disturbance stridulation: Its Defensive role

   • W. Mitchell Masters

   OriginalPaper Pages: 187 - 200

6. Goal-oriented and compass-oriented movements of displaced homing pigeons after confinement in differentially shielded aviaries

   • Hans G. Wallraff

   OriginalPaper Pages: 201 - 225