References
- Alatalo R. V., Gustafsson L., Lundberg A. 1984. Why do young passerine birds have shorter wings than older birds?Ibis 126: 410-415.
- Biebach H. 1977. Das Winterfell der Amsel. J. Orn. A: 117-133.
- Busse P. 1974. Biometrical methods. Not. Orn. 15: 114-126.
- Busse P. 1983. Biometrical standards in the Operation Baltic work.Ring 10: 125-137.
- Busse P. 1990. [Key to sexing and ageing of European Passerines]. Not. Orn. 31: 1-360. (in Polish).
- Busse P., Maksalon L. 1986. Biometrical variability of Song Thrushes migrating through Polish Baltic coast.Not. Orn. 27: 105-127.
- Cresswell W. 1997. Interference competition at low competitor densities in blackbird (Turdus merula).J. Anim. Ecol. 66: 461-471.
- Cresswell W. 1998. Diurnal and seasonal mass variation in Blackbirds (Turdus merula) consequences for mass-dependent predation risk.J. Anim. Ecol. 67: 78-90.
- Desrochers A. 1992a. Age and foraging success in European Blackbirds: variation between and within individuals.Anim. Behav. 43: 885-894.
- Desrochers A. 1992b. Age-related differences in reproduction by European Blackbirds: restraint or constraint.Ecology 73, 3: 1128-1131.
- Desrochers A., Magrath R. D. 1993. Age-specific fecundity in European blackbirds (Turdus merula): individual and population trends.Auk 110, 2: 255-263.
- Figuerola J., Gutierrez R. 2000. Why do juvenile Moustached Warblers have shorter wings?Ornis Fenn. 77: 183-187.
- Glutz von Blotzheim U. N., Bauer K., Bezzel E. 1971-1982. Handbuch der Võgel Mitteleuropas. vol. IV-IX. Frankfurt a. M.
- Graczyk R. 1959. Badania nad występowaniem i stanem ilościowym kosa (Turdus merula) w Polsce.Ekol. pol. A 7: 55-79. (in Polish).
- Graczyk R. 1961. Badania nad zmiennością, biologią i znaczeniem gospodarczym kosa (Turdus merula).Ekol. pol. A 9: 453-485. (in Polish).
- Havlin J. 1962. Promenlivost telesnych znaku kosa cerneho evropskeho, Turdus merula merula L.Zool. Listy 11: 1-14. (in Czech).
- Hendenstrom A., Alerstam T. 1998. How fast can birds migrate.J. Avian Biol. 29: 424-432.
- Koivula K., Orell M., Rytkõnen S., Lahti K. 1995. Fatness, sex and dominance; seasonal and daily body mass changes in Willow Tits.J. Avian Biol. 26: 209-210.
- Lima S. L. 1986. Predation risk and unpredictable feeding conditions; determinants of body mass in birds.Ecology. 67: 377-385.
- Metcalfe N. B., Ure S. E. 1995. Diurnal variation in flight performance and hence potential predation risk in small birds.Proc. R. Soc. Lond. Ser. B. 261: 395-400.
- Slagsvold T. 1982. Sex, size and natural selection in the Hooded Crow Corvus corone cornix.Ornis Scand. 13: 165-175.
- Svensson L. 1992. Identification Guide to European Passerines. Stockholm.
- Van Balen J. H. 1967. The significance of variation in body weight and wing length in the Great Tit, Parus major.Ardea 55: 1-59.
- Witter M. S., Cuthill I. C. 1993. The ecological costs of avian fat storage.Phil. Trans. R. Soc. Lond. B 340: 73-92.
- Witter M. S., Cuthill I. C., Bonser R. 1994. Experimental investigation of mass-dependent predation risk in the European Starling (Sturnus vulgaris).Anim. Behav. 48: 201-222.