Diddens, J.; Coussement, L.; Frankl-Vilches, C.; Majumdar, G.; Steyaert, S.; ter Haar, S. M.; Galle, J.; de Meester, E.; de Keulenaer, S.; van Criekinge, W. et al.; Cornil, C. A.; Balthazart, J.; van der Linden, A.; de Meyer, T.; Berghe, W. V.: DNA methylation regulates transcription factor specific neurodevelopmental but not sexually dimorphic gene expression dynamics in zebra finch telencephalon. Frontiers in Cell and Developmental Biology 9, 583555 (2021)

Elderbrock, E. K.; Hau, M.; Greives, T. J.: Sex steroids modulate circadian behavioral rhythms in captive animals, but does this matter in the wild? Hormones and Behavior 128, 104900 (2021)

Emmel, E. S.; Rivera, S.; Cabrera, F.; Blake, S.; Deem, S. L.: Field anesthesia and gonadal morphology of immature Western Santa Cruz tortoises (Chelonoidis porteri). Journal of zoo and Wildlife Medicine 51 (4), S. 848 - 855 (2021)

Evens, R.; Jacot, A.; Artois, T.; Ulenaers, E.; Neyens, T.; Rappaz, L.; Theux, C.; Pradervand, J.-N.: Improved ecological insights commission new conservation targets for a crepuscular bird species. Animal Conservation 24 (3), S. 457 - 469 (2021)

Fan, M.; Hall, M. L.; Roast, M.; Peters, A.; Delhey, K.: Variability, heritability and condition-dependence of the multidimensional male colour phenotype in a passerine bird. Heredity 127 (3), S. 300 - 311 (2021)

Feeney, W. E.; Bertucci, F.; Gairin, E.; Siu, G.; Waqalevu, V.; Antoine, M.; Lison de Loma, T.; Planes, S.; Galzin, R.; Lecchini, D.: Long term relationship between farming damselfish, predators, competitors and benthic habitat on coral reefs of Moorea Island. Scientific Reports 11, 14548 (2021)

Forstmeier, W.; Wang, D.; Martin, K.; Kempenaers, B.: Fitness costs of female choosiness are low in a socially monogamous songbird. PLoS Biology 19 (11), e3001257 (2021)

Francis, C. D.; Wilkins, M. R.: Testing the strength and direction of selection on vocal frequency using metabolic scaling theory. Ecosphere 12 (9), e03733 (2021)

Frasnelli, E.; Robert, T.; Chow, P. K. Y.; Scales, B.; Gibson, S.; Manning, N.; Philippides, A. O.; Collett, T. S.; de Ibarra, N. H.: Small and large bumblebees invest differently when learning about flowers. Current Biology 31 (5), S. 1058 - 1064 (2021)

Frawley, A. E.; DeMoranville, K. J.; Carbeck, K. M.; Trost, L.; Bryła, A.; Dzialo, M.; Sadowska, E. T.; Bauchinger, U.; Pierce, B. J.; McWilliams, S. R.: Season, anthocyanin supplementation, and flight training have mixed effects on the antioxidant system of migratory European Starlings. Ornithology 138 (3), ukab023 (2021)

Frawley, A. E.; DeMoranville, K. J.; Carbeck, K. M.; Trost, L.; Bryła, A.; Działo, M.; Sadowska, E. T.; Bauchinger, U.; Pierce, B. J.; McWilliams, S. R.: Flight training and dietary antioxidants have mixed effects on the oxidative status of multiple tissues in a female migratory songbird. The Journal of Experimental Biology 224 (21), jeb243158 (2021)

Gessara, I.; Dittrich, F.; Hertel, M.; Hildebrand, S.; Pfeifer, A.; Frankl-Vilches, C.; McGrew, M.; Gahr, M.: Highly efficient genome modification of cultured primordial germ cells with lentiviral vectors to generate transgenic songbirds. Stem Cell Reports 16 (4), S. 784 - 796 (2021)

Goymann, W.; Schwabl, H.: The tyranny of phylogeny - A plea for a less dogmatic stance on two-species comparisons. Bioessays 43 (8), 2100071 (2021)

Greives, T. J.; Eshleman, M.; Galante, H.; Elderbrock, E. K.; Deimel, C.; Hau, M.: Early nighttime testosterone peaks are correlated with GnRH-induced testosterone in a diurnal songbird. General and Comparative Endocrinology 312, 113861 (2021)

Hotta, T.; Awata, S.; Jordan, L. A.; Kohda, M.: Subordinate fish mediate aggressiveness using recent contest information. Frontiers in Ecology and Evolution 9, 685907 (2021)

Huffeldt, N. P.; Tigano, A.; Erikstad, K. E.; Goymann, W.; Jenni-Eiermann, S.; Moum, T.; Reiertsen, T. K.: The relationship between daily behavior, hormones, and a color dimorphism in a seabird under natural continuous light. Hormones and Behavior 130, 104930 (2021)

Husak, J. F.; Fuxjager, M. J.; Johnson, M. A.; Vitousek, M. N.; Donald, J. W.; Francis, C. J.; Goymann, W.; Hau, M.; Kircher, B. K.; Knapp, R. et al.; Martin, L. B.; Miller, E. T.; Schoenle, L. A.; Williams, T. D.: Life history and environment predict variation in testosterone across vertebrates. Evolution: International journal of organic evolution 75 (5), S. 1003 - 1010 (2021)

Jax, E.; Mueller, I.; Börno, S.; Borlinghaus, H.; Eriksson, G.; Fricke, E.; Timmermann, B.; Pendl, H.; Fiedler, W.; Klein, K. et al.; Schreiber, F.; Wikelski, M.; Magor, K. E.; Kraus, R. H. S.: Health monitoring in birds using bio‑loggers and whole blood transcriptomics. Scientific Reports 11, 10815 (2021)

Knief, U.; Forstmeier, W.: Violating the normality assumption may be the lesser of two evils. Behavior Research Methods 53 (6), S. 2576 - 2590 (2021)

Knief, U.; Forstmeier, W.; Kempenaers, B.; Wolf, J. B. W.: A sex chromosome inversion is associated with copy number variation of mitochondrial DNA in zebra finch sperm. Royal Society Open Science 8 (9), 211025 (2021)