1. Triadic and collaborative play by gorillas in social games with objects

   • Joanne E. Tanner
   • Richard W. Byrne

   Original Paper 12 January 2010 Pages: 591 - 607

2. Tits use amodal completion in predator recognition: a field experiment

   • Kateřina Tvardíková
   • Roman Fuchs

   Original Paper 04 February 2010 Pages: 609 - 615

   

3. Characteristics of implicit chaining in cotton-top tamarins (Saguinus oedipus)

   • Charles Locurto
   • Matthew Gagne
   • Lauren Nutile

   Original Paper 07 February 2010 Pages: 617 - 629

   

4. A modified mark test for own-body recognition in pig-tailed macaques (Macaca nemestrina)

   • Sara Macellini
   • Pier Francesco Ferrari
   • Annika Paukner

   Original Paper 11 February 2010 Pages: 631 - 639

   

5. Chimpanzees (Pan troglodytes) accurately compare poured liquid quantities

   • Michael J. Beran

   Original Paper 10 February 2010 Pages: 641 - 649

   

6. Erratum to: Chimpanzees (Pan troglodytes) accurately compare poured liquid quantities

   • Michael J. Beran

   Erratum 18 March 2010 Pages: 651 - 651

7. A positional coding mechanism in pigeons after learning multiple three-item lists

   • Damian Scarf
   • Michael Colombo

   Original Paper 11 February 2010 Pages: 653 - 661

   

8. Donor payoffs and other-regarding preferences in cotton-top tamarins (Saguinus oedipus)

   • Jeffrey R. Stevens

   Short Communication 04 February 2010 Pages: 663 - 670

   

9. Rational maximizing by humans (Homo sapiens) in an ultimatum game

   • Phillip Smith
   • Alan Silberberg

   Short Communication 04 February 2010 Pages: 671 - 677