1. How do horses (Equus caballus) learn from observing human action?

   • Kira Bernauer
   • Hanna Kollross
   • Konstanze Krueger

   Original Paper 17 September 2019 Pages: 1 - 9

   

2. What smells? Gauging attention to olfaction in canine cognition research

   • Alexandra Horowitz
   • Becca Franks

   Original Paper 12 October 2019 Pages: 11 - 18

   

3. Gestural communication in olive baboons (Papio anubis): repertoire and intentionality

   • Sandra Molesti
   • Adrien Meguerditchian
   • Marie Bourjade

   Original Paper 12 October 2019 Pages: 19 - 40

   

4. Complex visual analysis of ecologically relevant signals in Siamese fighting fish

   • Peter Neri

   Original Paper 04 October 2019 Pages: 41 - 53

   

5. On the transfer of spatial learning between geometrically different shaped environments in the terrestrial toad, Rhinella arenarum

   • María Inés Sotelo
   • José Andrés Alcalá
   • Rubén N. Muzio

   Original Paper 18 October 2019 Pages: 55 - 70

   

6. Delayed gratification in New Caledonian crows and young children: influence of reward type and visibility

   • Rachael Miller
   • Anna Frohnwieser
   • Nicola S. Clayton

   Original Paper Open access 19 October 2019 Pages: 71 - 85

   

7. Insensitivity to reward shifts in zebrafish (Danio rerio) and implications for assessing affective states

   • Sern Loong Timothy Tan
   • Kathrine Ann Handasyde
   • Michael Mendl

   Original Paper 13 November 2019 Pages: 87 - 100

   

8. Does humic acid alter visually and chemically guided foraging in stickleback fish?

   • Robert B. Mobley
   • Emily G. Weigel
   • Janette W. Boughman

   Original Paper 16 October 2019 Pages: 101 - 108

   

9. Serial reversal learning in freshwater stingrays (Potamotrygon motoro)

   • Martha M. M. Daniel
   • Vera Schluessel

   Original Paper 19 October 2019 Pages: 109 - 119

   

10. Effects of early life and current housing on sensitivity to reward loss in a successive negative contrast test in pigs

    • L. Luo
    • I. Reimert
    • J. E. Bolhuis

    Original Paper Open access 13 November 2019 Pages: 121 - 130

    

11. Effect of social organisation on interspecific differences in overmarking behaviour of foals in African equids

    • Jan Pluháček
    • Vladimíra Tučková
    • Sarah R. B. King

    Original Paper 14 November 2019 Pages: 131 - 140

    

12. Gazing as a help requesting behavior: a comparison of dogs participating in animal-assisted interventions and pet dogs

    • C. Cavalli
    • F. Carballo
    • M. Bentosela

    Original Paper 12 November 2019 Pages: 141 - 147

    

13. Face-to-face opening phase in Japanese macaques’ social play enhances and sustains participants’ engagement in subsequent play interaction

    • Sakumi Iki
    • Toshikazu Hasegawa

    Original Paper 12 November 2019 Pages: 149 - 158

    

14. The underestimated giants: operant conditioning, visual discrimination and long-term memory in giant tortoises

    • Tamar Gutnick
    • Anton Weissenbacher
    • Michael J. Kuba

    Original Paper 13 November 2019 Pages: 159 - 167

    

15. Combined predisposed preferences for colour and biological motion make robust development of social attachment through imprinting

    • Momoko Miura
    • Daisuke Nishi
    • Toshiya Matsushima

    Original Paper 11 November 2019 Pages: 169 - 188

    

16. The inhibitory control of pheasants (Phasianus colchicus) weakens when previously learned environmental information becomes unpredictable

    • Kandace R. Griffin
    • Christine E. Beardsworth
    • Joah R. Madden

    Original Paper Open access 16 December 2019 Pages: 189 - 202

    

17. Object categorization by wild-ranging birds in nest defence

    • Nela Nováková
    • Petr Veselý
    • Roman Fuchs

    Original Paper 28 November 2019 Pages: 203 - 213

    

18. Response learning confounds assays of inhibitory control on detour tasks

    • Jayden O. van Horik
    • Christine E. Beardsworth
    • Joah R. Madden

    Original Paper Open access 22 November 2019 Pages: 215 - 225

    

19. Picture recognition of food by sloth bears (Melursus ursinus)

    • S. Tabellario
    • M. A. Babitz
    • M. Brown-Palsgrove

    Short Communication 19 October 2019 Pages: 227 - 231

20. Spatial learning in Japanese eels (Anguilla japonica)

    • Shigeru Watanabe
    • Kazutaka Shinozuka

    Short Communication Open access 24 October 2019 Pages: 233 - 236