Safari, I.; Goymann, W.: The evolution of reversed sex roles and classical polyandry: Insights from coucals and other animals. Ethology 127 (1), S. 1 - 13 (2021)

Santema, P.; Kempenaers, B.: Offspring provisioning by extra‐pair males in blue tits. Journal of Avian Biology 52 (5), e02755 (2021)

Santema, P.; Schlicht, L.; Beck, K. B.; Kempenaers, B.: Effects of exposure to predator models on fledging behaviour in blue tits. Animal Behaviour 181, S. 61 - 69 (2021)

Santema, P.; Schlicht, L.; Beck, K. B.; Sheldon, B. C.; Kempenaers, B.: Why do nestling birds fledge early in the day? Animal Behaviour 174, S. 79 - 86 (2021)

Santema, P.; Schlicht, L.; Sheldon, B. C.; Kempenaers, B.: Experimental evidence that nestlings adjust their fledging time to each other in a multiparous bird. Animal Behaviour 180, S. 143 - 150 (2021)

Santema, P.; Teltscher, K. L.; Kempenaers, B.: Sperm numbers on the perivitelline layers of blue tit eggs are repeatable within a clutch, but independent of the occurrence of extra-pair paternity. Journal of Avian Biology 52 (10), e02826 (2021)

Schlicht, E.; Kempenaers, B.: Origin and outcome of social polygyny in the Blue Tit. Ardea 109 (1), S. 91 - 118 (2021)

Shaftel, R.; Rinella, D. J.; Kwon, E.; Brown, S. C.; Gates, H. R.; Kendall, S.; Lank, D. B.; Liebezeit, J. R.; Payer, D. C.; Rausch, J. et al.; Saalfeld, S. T.; Sandercock, B. K.; Smith, P. A.; Ward, D. H.; Lanctot, R. B.: Predictors of invertebrate biomass and rate of advancement of invertebrate phenology across eight sites in the North American Arctic. Polar Biology 44 (2), S. 237 - 257 (2021)

Sládeček, M.; Brynychová, K.; Elhassan, E.; Šálek, M. E.; Janatová, V.; Vozabulová, E.; Chajma, P.; Firlová, V.; Pešková, L.; Almuhery, A. et al.; Bulla, M.: Diel timing of nest predation changes across breeding season in a subtropical shorebird. Ecology and Evolution 11 (19), S. 13101 - 13117 (2021)

Sridhar, V. H.; Li, L.; Gorbonos, D.; Nagy, M.; Schell, B.; Sorochkin, T.; Gov, N. S.; Couzin, I. D.: The geometry of decision-making in individuals and collectives. Proceedings of the National Academy of Sciences of the United States of America 118 (50), e2102157118 (2021)

Stidsholt, L.; Greif, S.; Goerlitz, H. R.; Beedholm, K.; Macaulay, J.; Johnson, M.; Madsen, P. T.: Hunting bats adjust their echolocation to receive weak prey echoes for clutter reduction. Science Advances 7 (10), eabf1367 (2021)

Stidsholt, L.; Johnson, M.; Goerlitz, H. R.; Madsen, P. T.: Wild bats briefly decouple sound production from wingbeats to increase sensory flow during prey captures. iScience 24 (8), 102896 (2021)

Sütterlin, C.; Yu, X.: Aristotle’s dream: Evolutionary and neural aspects of aesthetic communication in the arts. PsyCh Journal 10 (2), S. 224 - 243 (2021)

Toda, Y.; Ko, M.-C.; Liang, Q.; Miller, E. T.; Rico-Guevara, A.; Nakagita, T.; Sakakibara, A.; Uemura, K.; Sackton, T.; Hayakawa, T. et al.; Sin, S. Y. W.; Ishimaru, Y.; Misaka, T.; Oteiza, P.; Crall, J.; Edwards, S. V.; Buttemer, W.; Matsumura, S.; Baldwin, M. W.: Early origin of sweet perception in the songbird radiation. Science 373 (6551), S. 226 - 231 (2021)

Torres Ortiz, S.; Stedt, J.; Midtiby, H. S.; Egemose, H. D.; Wahlberg, M.: Group hunting in harbour porpoises (Phocoena phocoena). Canadian Journal of Zoology-Revue Canadienne de Zoologie 99 (6), S. 511 - 520 (2021)

Turjeman, S.; Eggers, U.; Rotics, S.; Fiedler, W.; Centeno‐Cuadros, A.; Kaatz, M.; Zurell, D.; Jeltsch, F.; Wikelski, M.; Nathan, R.: Estimating nest‐switching in free‐ranging wild birds: An assessment of the most common methodologies, illustrated in the White Stork (Ciconia ciconia). Ibis 163 (3), S. 1110 - 1119 (2021)

Ungurean, G.; Martinez-Gonzalez, M. D.; Massot, B.; Libourel, P.-A.; Rattenborg, N. C.: Pupillary behavior during wakefulness, non-REM sleep, and REM sleep in birds is opposite that of mammals. Current Biology 31 (23), S. 5370 - 5376.e4 (2021)

Urban, S.; Nater, A.; Meyer, A.; Kratochwil, C. F.: Different sources of allelic variation drove repeated color pattern divergence in cichlid fishes. Molecular Biology and Evolution 38 (2), S. 465 - 477 (2021)

Valcu, C.-M.; Valcu, M.; Kempenaers, B.: The macroecology of extra-pair paternity in birds. Molecular Ecology 30 (19), S. 4884 - 4898 (2021)

van Hasselt, S. J.; Hut, R. A.; Allocca, G.; Vyssotski, A. L.; Piersma, T.; Rattenborg, N. C.; Meerlo, P.: Cloud cover amplifies the sleep-suppressing effect of artificial light at night in geese. Environmental Pollution 273, 116444 (2021)