1. Vultures as an overlooked model in cognitive ecology

   • Thijs van Overveld
   • Daniel Sol
   • José Antonio Donázar

   Review 24 November 2021 Pages: 495 - 507

   

2. Operant conditioning in antlion larvae and its impairment following exposure to elevated temperatures

   • Krzysztof Miler
   • Inon Scharf

   Original Paper Open access 24 October 2021 Pages: 509 - 518

   

3. Innovative problem-solving in a threatened gull species, the Olrog’s Gull (Larus atlanticus)

   • Melina Vanesa Castano
   • Laura Marina Biondi
   • Germán Oscar García

   Original Paper 27 October 2021 Pages: 519 - 527

   

4. Behavioural factors underlying innovative problem-solving differences in an avian predator from two contrasting habitats

   • Laura Marina Biondi
   • Giselle Fuentes
   • Maria Susana

   Original Paper 28 October 2021 Pages: 529 - 543

   

5. Domestic dogs (Canis lupus familiaris) are sensitive to the correlation between pitch and timbre in human speech

   • Sasha K. Sturdy
   • David R. R. Smith
   • David N. George

   Original Paper Open access 29 October 2021 Pages: 545 - 554

   

6. Searching high and low: domestic dogs’ understanding of solidity

   • Julia Espinosa
   • Emma C. Tecwyn
   • Daphna Buchsbaum

   Original Paper 29 October 2021 Pages: 555 - 570

   

7. Adjustment in the point-following behaviour of free-ranging dogs – roles of social petting and informative-deceptive nature of cues

   • Debottam Bhattacharjee
   • Anindita Bhadra

   Original Paper 06 November 2021 Pages: 571 - 579

   

8. Exploratory decisions of Trinidadian guppies when uncertain about predation risk

   • Adam L. Crane
   • Ebony E. Demers
   • Grant E. Brown

   Original Paper 06 November 2021 Pages: 581 - 587

   

9. Nest size matters: common cuckoos prefer to parasitize larger nests of Oriental reed warblers

   • Longwu Wang
   • Gangbin He
   • Wei Liang

   Original Paper 12 November 2021 Pages: 589 - 595

   

10. Breed group differences in the unsolvable problem task: herding dogs prefer their owner, while solitary hunting dogs seek stranger proximity

    • Enya Van Poucke
    • Amanda Höglin
    • Lina S. V. Roth

    Original Paper Open access 18 November 2021 Pages: 597 - 603

    

11. Do sex differences in construction behavior relate to differences in physical cognitive abilities?

    • Connor T. Lambert
    • Gopika Balasubramanian
    • Lauren M. Guillette

    Original Paper 19 November 2021 Pages: 605 - 615

    

12. Does quantity matter to a stingless bee?

    • Johanna Eckert
    • Manuel Bohn
    • Johannes Spaethe

    Original Paper Open access 23 November 2021 Pages: 617 - 629

    

13. Overlooked evidence for semantic compositionality and signal reduction in wild chimpanzees (Pan troglodytes)

    • Petar Gabrić

    Original Paper Open access 25 November 2021 Pages: 631 - 643

14. Context-dependent use of olfactory cues by foragers of Vespula germanica social wasps

    • M. B. Yossen
    • M. Buteler
    • M. Lozada

    Original Paper 28 November 2021 Pages: 645 - 655

    

15. Persistence is key: investigating innovative problem solving by Asian elephants using a novel multi-access box

    • Sarah L. Jacobson
    • Amanda Puitiza
    • Joshua M. Plotnik

    Original Paper 28 November 2021 Pages: 657 - 669

    

16. Captivity and habituation to humans raise curiosity in vervet monkeys

    • Sofia Ingrid Fredrika Forss
    • Alba Motes-Rodrigo
    • Erica van de Waal

    Original Paper Open access 02 December 2021 Pages: 671 - 682

    

17. Spaced training enhances equine learning performance

    • Frederick R. Holcomb
    • Kristi S. Multhaup
    • Sarah E. Daniels

    Original Paper Open access 03 December 2021 Pages: 683 - 690

    

18. Mirror-mediated string-pulling task in Eurasian jays (Garrulus glandarius)

    • Luigi Baciadonna
    • Francesca M. Cornero
    • Nathan J. Emery

    Original Paper Open access 16 December 2021 Pages: 691 - 700

    

19. An exploratory analysis of head-tilting in dogs

    • Andrea Sommese
    • Ádám Miklósi
    • Claudia Fugazza

    Short Communication Open access 26 October 2021 Pages: 701 - 705

    

20. Correction to: Does inequity aversion depend on a frustration effect? A test with capuchin monkeys (Cebus apella)

    • Alan Silberberg
    • Lara Crescimbene
    • Elisabetta Visalberghi

    Correction 20 December 2021 Pages: 707 - 708

    

21. Correction to: Developing a feasible and sensitive judgement bias task in dairy cows

    • Louise Kremer
    • Cornelis G. van Reenen
    • Laura E. Webb

    Correction 27 November 2021 Pages: 709 - 709