1. Testing the maintenance of natural responses to survival-relevant calls in the conservation breeding population of a critically endangered corvid (Corvus hawaiiensis)

   • Anne C. Sabol
   • Alison L. Greggor
   • Ronald R. Swaisgood

   Original Article 15 January 2022 Article: 21

   

2. Robustness in action: Leg loss does not affect mating success in male harvestmen

   • Ignacio Escalante
   • Damian O. Elias

   Original Article Open access 14 January 2022 Article: 20

   

3. The face never lies: facial expressions and mimicry modulate playful interactions in wild geladas

   • Alessandro Gallo
   • Anna Zanoli
   • Elisabetta Palagi

   Original Article Open access 14 January 2022 Article: 19

   

4. Sex difference in homing: males but not females return home despite offspring mortality in Ikakogi tayrona, a glassfrog with prolonged maternal care

   • P. Navarro-Salcedo
   • L. F. Arcila-Pérez
   • F. Vargas-Salinas

   Original Article 13 January 2022 Article: 18

   

5. Female gray treefrogs maintain mate choice decisions under predation threat, but adjust movements to reduce conspicuousness during mate approach

   • Olivia S Feagles
   • Gerlinde Höbel

   Original Article 12 January 2022 Article: 17

   

6. Socio-sexual behaviors and fecal hormone metabolites but not age predict female aggressive interactions in Macaca arctoides

   • Ana Lilia Cerda-Molina
   • Lilian Mayagoitia-Novales
   • Gilberto Matamoros-Trejo

   Original Article 08 January 2022 Article: 16

   

7. Restricted use of space in an endemic lizard of the Andes: addressing the effects of intrinsic and environmental factors

   • Ana E. Victorica Erostarbe
   • Gustavo A. Fava
   • Juan C. Acosta

   Featured Student Research Paper 08 January 2022 Article: 15

   

8. Food-hoarding and nest-building propensities are associated in a cavity-nesting bird

   • Benjamin R. Sonnenberg
   • Carrie L. Branch
   • Vladimir V. Pravosudov

   Original Article 07 January 2022 Article: 14

   

9. Priority of access to food and its influence on social dynamics of an endangered carnivore

   • N. R. Jordan
   • K. A. Golabek
   • J. W. McNutt

   Original Article 07 January 2022 Article: 13

   

10. Convergent evolution of antlions and wormlions: similarities and differences in the behavioural ecology of unrelated trap-building predators

    • Krzysztof Miler
    • Inon Scharf

    Review 05 January 2022 Article: 12

    

11. No evidence for innate differences in tadpole behavior between natural, urbanized, and invasive populations

    • Max Mühlenhaupt
    • James Baxter-Gilbert
    • John Measey

    Original Article 05 January 2022 Article: 11

    

12. Where are the males? The influence of bottom-up and top-down factors and sociability on the spatial distribution of a territorial ungulate

    • A. Panebianco
    • P. F. Gregorio
    • P. D. Carmanchahi

    Original Article 05 January 2022 Article: 10

    

13. In mixed company: two macaws are self-regarding in a symbolic prosocial choice task

    • Jessica Ann Leete
    • Jennifer Vonk

    Featured Student Research Paper 04 January 2022 Article: 9

    

14. Correction to: Cooperation by ant queens during colony‑founding perpetuates alternative forms of social organization

    • Pierre Blacher
    • Ornela De Gasperin
    • Michel Chapuisat

    Correction Open access 31 December 2021 Article: 8

15. Decoupled evolution of mating biology and social structure in Acromyrmex leaf-cutting ants

    • Romain A. Dahan
    • Nathan K. Grove
    • Christian Rabeling

    Original Article Open access 30 December 2021 Article: 7

    

16. Influence of different weather aspects on breeding performance, food supply and nest-space use in hoopoe offspring

    • Soňa Nuhlíčková
    • Ján Svetlík
    • Herbert Hoi

    Original Article Open access 29 December 2021 Article: 6

    

17. The gullible genius: fast learners fall for fake news

    • Ioanna Gavriilidi
    • Simon Baeckens
    • Raoul Van Damme

    Original Article 29 December 2021 Article: 5

    

18. Termite eusociality and contrasting selective pressure on social and innate immunity

    • Mark S. Bulmer
    • Alanna M. Stefano

    Original Article 29 December 2021 Article: 4

    

19. Evidence of intrapopulation differences in rattlesnake defensive behavior across neighboring habitats

    • Marcus C. P. Atkins
    • Chloe R. Howarth
    • Karl W. Larsen

    Featured Student Research Paper 28 December 2021 Article: 3

    

20. Population specific annual cycles and migration strategies in a leap-frog migrant

    • Linus Hedh
    • Juliana Dänhardt
    • Anders Hedenström

    Original Article Open access 28 December 2021 Article: 2

    

21. Food preference and food type innovation of surface- vs. cave-dwelling waterlouse (Asellus aquaticus) after 60 000 years of isolation

    • Gábor Herczeg
    • Viktória Nyitrai
    • Gergely Horváth

    Original Article Open access 15 December 2021 Article: 1