1. Animal expertise, conscious or not

   • William S. Helton

   Review 08 September 2004 Pages: 67 - 74

2. Successive reversal of concurrent discriminations by macaques (Macaca mulatta): proactive interference effects

   • F. Robert Treichler

   Original Article 08 September 2004 Pages: 75 - 83

   

3. Chimpanzees’ (Pan troglodytes) use of gaze cues in object-choice tasks: different methods yield different results

   • Jochen Barth
   • James E. Reaux
   • Daniel J. Povinelli

   Original Article 22 September 2004 Pages: 84 - 92

   

4. Song copying by humpback whales: themes and variations

   • Eduardo Mercado III
   • Louis M. Herman
   • Adam A. Pack

   Original Article 15 October 2004 Pages: 93 - 102

   

5. Tool-use learning in Tonkean macaques (Macaca tonkeana)

   • Ana Maria Ducoing
   • Bernard Thierry

   Original Article 22 September 2004 Pages: 103 - 113

   

6. Foraging behaviour in domestic pigs (Sus scrofa): remembering and prioritizing food sites of different value

   • S Held
   • J Baumgartner
   • M Mendl

   Original Article 03 November 2004 Pages: 114 - 121

   

7. Detour behaviour in three species of birds: quails (Coturnix sp.), herring gulls (Larus cachinnans) and canaries (Serinus canaria)

   • Paolo Zucca
   • Fabrizio Antonelli
   • Giorgio Vallortigara

   Original Article 24 September 2004 Pages: 122 - 128

   

8. Do chickens (Gallus gallus f. domestica) decompose visual figures?

   • Christian W. Werner
   • Inga Tiemann
   • Gerd Rehkämper

   Original Article 15 October 2004 Pages: 129 - 140

   

9. Configural/holistic processing or differential element versus compound similarity

   • Thomas R. Zentall

   Commentary 22 September 2004 Pages: 141 - 142