1. A review of the unsolvable task in dog communication and cognition: comparing different methodologies

   • Juliana Wallner Werneck Mendes
   • Briseida Resende
   • Carine Savalli

   Review 23 March 2021 Pages: 907 - 922

   

2. Neural substrates involved in the cognitive information processing in teleost fish

   • R. Calvo
   • V. Schluessel

   Review Open access 27 April 2021 Pages: 923 - 946

   

3. Using a new video rating tool to crowd-source analysis of behavioural reaction to stimuli

   • Holly Root-Gutteridge
   • Louise P. Brown
   • David Reby

   Methods Paper Open access 09 March 2021 Pages: 947 - 956

   

4. A kestrel without hooked beak and talons is not a kestrel for the red-backed shrike (Lanius collurio)

   • Michal Němec
   • Tereza Kučerová
   • Roman Fuchs

   Original Paper 19 March 2021 Pages: 957 - 968

   

5. I know a dog when I see one: dogs (Canis familiaris) recognize dogs from videos

   • Paolo Mongillo
   • Carla Eatherington
   • Lieta Marinelli

   Original Paper Open access 19 March 2021 Pages: 969 - 979

   

6. Two-dimensional reward evaluation in mice

   • Vladislav Nachev
   • Marion Rivalan
   • York Winter

   Original Paper Open access 15 March 2021 Pages: 981 - 998

   

7. Horses are sensitive to baby talk: pet-directed speech facilitates communication with humans in a pointing task and during grooming

   • Léa Lansade
   • Miléna Trösch
   • Ludovic Calandreau

   Original Paper 18 March 2021 Pages: 999 - 1006

   

8. Social context shapes cognitive abilities: associative memories are modulated by fight outcome and social isolation in the crab Neohelice granulata

   • M. Jimena Santos
   • Santiago A. Merlo
   • Maria E. Pedreira

   Original Article 31 March 2021 Pages: 1007 - 1026

   

9. The effect of urbanization on innovation in spotted hyenas

   • Lily Johnson-Ulrich
   • Gidey Yirga
   • Kay E. Holekamp

   Original Paper 09 March 2021 Pages: 1027 - 1038

   

10. Watching others in a positive state does not induce optimism bias in common marmosets (Callithrix jacchus), but leads to behaviour indicative of competition

    • J. E. C. Adriaense
    • V. Šlipogor
    • T. Bugnyar

    Original Paper Open access 16 March 2021 Pages: 1039 - 1056

    

11. Equal performance but distinct behaviors: sex differences in a novel object recognition task and spatial maze in a highly social cichlid fish

    • Kelly J. Wallace
    • Hans A. Hofmann

    Original Paper 15 March 2021 Pages: 1057 - 1073

    

12. Prosociality and reciprocity in bottlenose dolphins (Tursiops truncatus)

    • Mathilde Lalot
    • Fabienne Delfour
    • Dalila Bovet

    Original Paper 17 March 2021 Pages: 1075 - 1086

    

13. The performance of domestic dogs (Canis lupus familiaris) on two versions of the object choice task

    • Hannah Clark
    • David A. Leavens

    Original Paper Open access 09 March 2021 Pages: 1087 - 1098

    

14. If horses had toes: demonstrating mirror self recognition at group level in Equus caballus

    • Paolo Baragli
    • Chiara Scopa
    • Elisabetta Palagi

    Original Paper Open access 13 March 2021 Pages: 1099 - 1108

    

15. Feline communication strategies when presented with an unsolvable task: the attentional state of the person matters

    • Lingna Zhang
    • Katie B. Needham
    • François Martin

    Original Paper Open access 02 April 2021 Pages: 1109 - 1119

    

16. Performance of Asian elephants (Elephas maximus) on a quantity discrimination task is similar to that of African savanna elephants (Loxodonta africana)

    • Rebecca J. Snyder
    • Lisa P. Barrett
    • Bonnie M. Perdue

    Original Paper 03 April 2021 Pages: 1121 - 1131

    

17. Production of regular rhythm induced by external stimuli in rats

    • Noriko Katsu
    • Shoko Yuki
    • Kazuo Okanoya

    Original Paper 22 March 2021 Pages: 1133 - 1141

    

18. 2D or not 2D? An fMRI study of how dogs visually process objects

    • Ashley Prichard
    • Raveena Chhibber
    • Gregory S. Berns

    Original Paper 27 March 2021 Pages: 1143 - 1151