1. Tool-use-associated sound in the evolution of language

   • Matz Larsson

   Review 29 June 2015 Pages: 993 - 1005

2. Relative versus absolute numerical representation in fish: Can guppies represent “fourness”?

   • Maria Elena Miletto Petrazzini
   • Christian Agrillo
   • Angelo Bisazza

   Original Paper 07 April 2015 Pages: 1007 - 1017

   

3. When is it worth waiting for? Food quantity, but not food quality, affects delay tolerance in tufted capuchin monkeys

   • Francesca De Petrillo
   • Emanuele Gori
   • Elsa Addessi

   Original Paper 18 April 2015 Pages: 1019 - 1029

   

4. A temporal context repetition effect in rats during a novel object recognition memory task

   • Joseph R. Manns
   • Claire R. Galloway
   • Per B. Sederberg

   Original Paper 28 April 2015 Pages: 1031 - 1037

   

5. Rats demonstrate helping behavior toward a soaked conspecific

   • Nobuya Sato
   • Ling Tan
   • Maya Okada

   Original Paper 12 May 2015 Pages: 1039 - 1047

   

6. Erratum to: Rats demonstrate helping behavior toward a soaked conspecific

   • Nobuya Sato
   • Ling Tan
   • Maya Okada

   Erratum 25 July 2015 Pages: 1049 - 1049

7. Experimental evidence of contagious yawning in budgerigars (Melopsittacus undulatus)

   • Andrew C. Gallup
   • Lexington Swartwood
   • Serena Sackett

   Original Paper 27 May 2015 Pages: 1051 - 1058

   

8. Visual illusions in predator–prey interactions: birds find moving patterned prey harder to catch

   • Liisa Hämäläinen
   • Janne Valkonen
   • Bibiana Rojas

   Original Paper 07 May 2015 Pages: 1059 - 1068

   

9. Chimpanzees strategically manipulate what others can see

   • Katja Karg
   • Martin Schmelz
   • Michael Tomasello

   Original Paper 12 May 2015 Pages: 1069 - 1076

   

10. Perception and discrimination of movement and biological motion patterns in fish

    • V. Schluessel
    • N. Kortekamp
    • H. Bleckmann

    Original Paper 17 May 2015 Pages: 1077 - 1091

    

11. The learning of action sequences through social transmission

    • Andrew Whalen
    • Daniel Cownden
    • Kevin Laland

    Original Paper 26 May 2015 Pages: 1093 - 1103

    

12. Waiting for what comes later: capuchin monkeys show self-control even for nonvisible delayed rewards

    • Bonnie M. Perdue
    • Jessica L. Bramlett
    • Michael J. Beran

    Original Paper 30 May 2015 Pages: 1105 - 1112

    

13. Song plasticity over time and vocal learning in clay-colored thrushes

    • Luis E. Vargas-Castro
    • Natalie V. Sánchez
    • Gilbert Barrantes

    Original Paper 27 June 2015 Pages: 1113 - 1123

    

14. Quantification acuity in spontaneous shoaling decisions of three-spined sticklebacks

    • Marion Mehlis
    • Timo Thünken
    • Joachim G. Frommen

    Original Paper 23 June 2015 Pages: 1125 - 1131

    

15. Experimental shifts in egg–nest contrasts do not alter egg rejection responses in an avian host–brood parasite system

    • Mark E. Hauber
    • Zachary Aidala
    • Csaba Moskát

    Original Paper 29 June 2015 Pages: 1133 - 1141

    

16. Conditional discrimination and response chains by worker bumblebees (Bombus impatiens Cresson, Hymenoptera: Apidae)

    • Hamida B. Mirwan
    • Peter G. Kevan

    Original Paper 07 July 2015 Pages: 1143 - 1154

    

17. Titmouse calling and foraging are affected by head and body orientation of cat predator models and possible experience with real cats

    • D. L. Book
    • Todd M. Freeberg

    Original Paper 30 June 2015 Pages: 1155 - 1164

    

18. Learned vocal and breathing behavior in an enculturated gorilla

    • Marcus Perlman
    • Nathaniel Clark

    Original Paper 03 July 2015 Pages: 1165 - 1179

19. Carrion crows learn to discriminate between calls of reliable and unreliable conspecifics

    • Claudia A. F. Wascher
    • Friederike Hillemann
    • Vittorio Baglione

    Short Communication 12 June 2015 Pages: 1181 - 1185

    

20. Pigeons (Columba livia) fail to connect dots in learning biological motion

    • Eriko Yamamoto
    • Kazuhiro Goto
    • Shigeru Watanabe

    Short Communication 05 June 2015 Pages: 1187 - 1191

    

21. Erratum to: Emotions on the loose: emotional contagion and the role of oxytocin in pigs

    • Inonge Reimert
    • J. Elizabeth Bolhuis
    • T. Bas Rodenburg

    Erratum 13 June 2015 Pages: 1193 - 1194