Why do dogs look back at the human in an impossible task? Looking back behaviour may be over-interpreted Martina LazzaroniSarah Marshall-PesciniFriederike Range Original Paper Open access 23 February 2020 Pages: 427 - 441
Dogs wait longer for better rewards than wolves in a delay of gratification task: but why? Friederike RangeDésirée BrucksZsófia Virányi Original Paper Open access 14 February 2020 Pages: 443 - 453
Performance of blue-fronted amazon parrots (Amazona aestiva) when solving the pebbles-and-seeds and multi-access-box paradigms: ex situ and in situ experiments Lucas GodinhoYuri MarinhoBruna Bezerra Original Paper 07 February 2020 Pages: 455 - 464
Perception of dynamic facial expressions of emotion between dogs and humans Catia Correia-CaeiroKun GuoDaniel S. Mills Original Paper Open access 12 February 2020 Pages: 465 - 476
Sex differences in vocalization are reflected by event-related potential components in the music frog Di ShenKe FangGuangzhan Fang Original Paper 03 February 2020 Pages: 477 - 490
Revisiting more or less: influence of numerosity and size on potential prey choice in the domestic cat Jimena ChachaPéter SzencziOxána Bánszegi Original Paper 12 February 2020 Pages: 491 - 501
Pigeons can learn a difficult discrimination if reinforcement is delayed following choice Dalton HouseDaniel PengThomas R. Zentall Original Paper 21 February 2020 Pages: 503 - 508
Food density and preferred quantity: discrimination of small and large numbers in angelfish (Pterophyllum scalare) Luis M. Gómez-LaplazaRobert Gerlai Original Paper 03 February 2020 Pages: 509 - 522
Animal cognition in the field: performance of wild vervet monkeys (Chlorocebus pygerythrus) on a reversal learning task L. Tamara KumpanEve A. SmeltzerJulie A. Teichroeb Original Paper 05 February 2020 Pages: 523 - 534
Guppies show sex and individual differences in the ability to inhibit behaviour Tyrone Lucon-XiccatoAngelo BisazzaCristiano Bertolucci Original Paper 07 February 2020 Pages: 535 - 543
Spatial cognition in western gorillas (Gorilla gorilla): an analysis of distance, linearity, and speed of travel routes Roberta SalmiAndrea PresottoDiane M. Doran-Sheehy Original Paper 14 February 2020 Pages: 545 - 557
How does the expressiveness of leaders affect followership in domestic horses (Equus ferus caballus)? Caroline GérardMathilde ValenchonOdile Petit Original Paper 17 February 2020 Pages: 559 - 569
Odor span task in dogs (Canis familiaris) Sarah KrichbaumBart RogersJeffrey S. Katz Original Paper 25 February 2020 Pages: 571 - 580
Marmoset prosociality is intentional Judith M. BurkartCarel P. van Schaik Original Paper Open access 27 February 2020 Pages: 581 - 594
Acoustic discrimination of predators by black-capped chickadees (Poecile atricapillus) Jenna V. CongdonAllison H. HahnChristopher B. Sturdy Original Paper 27 February 2020 Pages: 595 - 611