Numerical ability in fish species: preference between shoals of different sizes varies among singletons, conspecific dyads and heterospecific dyads Yang BaiZhong-Hua TangShi-Jian Fu Original Paper 12 December 2018 Pages: 133 - 143
Gaze following in an asocial reptile (Eublepharis macularius) Joe SimpsonSean J. O’Hara Original Paper Open access 22 December 2018 Pages: 145 - 152
Does a cichlid fish process face holistically? Evidence of the face inversion effect Kento KawasakaTakashi HottaMasanori Kohda Original Paper 02 January 2019 Pages: 153 - 162
Do cuttlefish have fraction number sense? Yi-Huei HuangHsu-Jung LinChuan-Chin Chiao Original Paper 02 January 2019 Pages: 163 - 168
Evolutionary origins of money categorization and exchange: an experimental investigation in tufted capuchin monkeys (Sapajus spp.) Francesca De PetrilloMartina CaroliElsa Addessi Original Paper 02 January 2019 Pages: 169 - 186
Absolute brain size predicts dog breed differences in executive function Daniel J. HorschlerBrian HareEvan L. MacLean Original Paper 03 January 2019 Pages: 187 - 198
Bats increase vocal amplitude and decrease vocal complexity to mitigate noise interference during social communication Tinglei JiangXiong GuoJagmeet S. Kanwal Original Paper 10 January 2019 Pages: 199 - 212
Running paths to nowhere: repetition of routes shows how navigating ants modulate online the weights accorded to cues Antoine WystrachSebastian SchwarzKen Cheng Original Paper 25 January 2019 Pages: 213 - 222
Discrimination of group numerousness under predation risk in anuran tadpoles Alessandro BalestrieriAndrea GazzolaGiorgio Vallortigara Original Paper 23 January 2019 Pages: 223 - 230
Test of four hypotheses to explain the function of overmarking in foals of four equid species Jan PluháčekVladimíra TučkováRadka Šárová Original Paper 30 January 2019 Pages: 231 - 241
Pet dogs exhibit social preference for people who synchronize with them: what does it tell us about the evolution of behavioral synchronization? Charlotte DurantonThierry BedossaFlorence Gaunet Original Paper 25 January 2019 Pages: 243 - 250
Spatial mapping shows that some African elephants use cognitive maps to navigate the core but not the periphery of their home ranges Andrea PresottoRichard Fayrer-HoskenMarguerite Madden Original Paper 28 January 2019 Pages: 251 - 263
Tortoises develop and overcome position biases in a reversal learning task Justin M. BridgemanGlenn J. Tattersall Original Paper 01 February 2019 Pages: 265 - 275
Precise relative-quantity judgement in the striped field mouse Apodemus agrarius Pallas Zhanna ReznikovaSofia PanteleevaNataliya Vorobyeva Original Paper 01 February 2019 Pages: 277 - 289
