1. The road ahead for sunk costs

   • Marco Vasconcelos

   OriginalPaper 20 February 2019 Pages: 1 - 2

2. Novel methodology to assess vocal learning in nature

   • Marisa Hoeschele

   Outlook 11 March 2019 Pages: 3 - 4

3. Mickey Mouse’s negative affect facing mistakes

   • Vassilissa Dolivo

   OUTLOOK 01 April 2019 Pages: 5 - 6

4. A special issue in honour of Stephen Lea – a true comparative psychologist

   • Lisa Leaver
   • Anna Wilkinson

   EditorialNotes 29 January 2020 Pages: 7 - 8

5. Taking pigeons to heart: Birds proficiently diagnose human cardiac disease

   • Victor M. Navarro
   • Edward A. Wasserman
   • Piotr Slomka

   OriginalPaper 21 January 2020 Pages: 9 - 21

   

6. Discrimination of artificial starry sky by pigeons

   • Shigeru Watanabe

   OriginalPaper 10 February 2020 Pages: 22 - 26

   

7. Tracking of unpredictable moving stimuli by pigeons

   • Anna Wilkinson
   • Kimberly Kirkpatrick

   OriginalPaper Open access 03 February 2020 Pages: 27 - 40

   

8. Pigeons process actor-action configurations more readily than bystander-action configurations

   • Muhammad A. J. Qadri
   • Robert G. Cook

   OriginalPaper 10 February 2020 Pages: 41 - 52

   

9. The whole is equal to the sum of its parts: Pigeons (Columba livia) and crows (Corvus macrorhynchos) do not perceive emergent configurations

   • Kazuhiro Goto
   • Shigeru Watanabe

   OriginalPaper 28 January 2020 Pages: 53 - 65

   

10. A dimensional summation account of polymorphous category learning

    • Andy J. Wills
    • Lyn Ellett
    • Tom Beesley

    OriginalPaper 13 March 2020 Pages: 66 - 83

    

11. No evidence that footedness in pheasants influences cognitive performance in tasks assessing colour discrimination and spatial ability

    • Mark A. Whiteside
    • Mackenzie M. Bess
    • Joah R. Madden

    OriginalPaper Open access 08 January 2020 Pages: 84 - 95

    

12. Learning is negatively associated with strength of left/right paw preference in wild grey squirrels (Sciurus carolinensis)

    • Lisa A. Leaver
    • Steph Ford
    • Tim W. Fawcett

    OriginalPaper Open access 21 January 2020 Pages: 96 - 103

    

13. Influence of seeing a red face during the male–male encounters of mosquito-specialist spiders

    • Fiona R. Cross
    • Robert R. Jackson
    • Lisa A. Taylor

    OriginalPaper 23 January 2020 Pages: 104 - 112

    

14. Selective overimitation in dogs

    • Ludwig Huber
    • Kaja Salobir
    • Giulia Cimarelli

    OriginalPaper 23 January 2020 Pages: 113 - 123

    

15. Reorientation by features and geometry: Effects of healthy and degenerative age-related cognitive decline

    • Kevin Leonard
    • Viktoriya Vasylkiv
    • Debbie M. Kelly

    OriginalPaper 08 January 2020 Pages: 124 - 134

    

16. Associative models fail to characterize transitive inference performance in rhesus monkeys (Macaca mulatta)

    • Olga F. Lazareva
    • Regina Paxton Gazes
    • Robert Hampton

    OriginalPaper 10 February 2020 Pages: 135 - 148

    

17. Measuring response inhibition with a continuous inhibitory-control task

    • Christina Meier
    • Stephen E. G. Lea
    • Ian P. L. McLaren

    OriginalPaper 29 January 2020 Pages: 149 - 164

    

18. Enhancing “self-control”: The paradoxical effect of delay of reinforcement

    • Thomas R. Zentall

    OriginalPaper 05 February 2020 Pages: 165 - 172

    

19. Behavioral flexibility: A review, a model, and some exploratory tests

    • Stephen E. G. Lea
    • Pizza K. Y. Chow
    • Ian P. L. McLaren

    OriginalPaper Open access 10 February 2020 Pages: 173 - 187