1.

U. Bährmann 1960. Untersuchungen über das Körpergewicht von einer Anzahl Saatkrähen aus einer mitteldeutschen Winterpopulation. Anz. orn Ges. Bayern 5: 573–577. Google Scholar

2.

S. P. Baldwin , & S. C. Kendeigh . 1938. Variations in the weight of birds. Auk 55:416–467. Google Scholar

3.

J. V. Beer , & H. Boyd . 1962. Weights of Pink-footed Geese in autumn. Bird Study 9: 91–99. Google Scholar

4.

J. V. Beer , & H. Boyd . 1963. Measurements of White-fronted Geese wintering at Slimbridge. Rep. Wildfowl Trust 14: 114–119. Google Scholar

5.

M. M. Betts 1955. The food of titmice in oak woodland. J. Anim. Ecol. 24: 282–323. Google Scholar

6.

L. Björn 1960. Om könskvoten samt ving- och totallängden hos talgoxen (Parus major). Vår Fågelvärld 19: 146–157. Google Scholar

7.

F. G. Cooch , & G. M. Stirrett & G. F. Boyer . 1960. Autumn weights of Blue Geese. Auk 77: 460–465. Google Scholar

8.

R. K. Cornwallis , & A. E. Smith . 1960. The bird in the hand. Oxford. Google Scholar

9.

S. Cramp 1963. Movements of tits in Europe in 1959 and after. Brit. Birds 56:237–263. Google Scholar

10.

G. Creutz 1950. Die Vogelberingung im Dienste der Gefiederforschung. Syllegomena biologica. Festschrift Kleinschmidt: 92–109. Google Scholar

11.

J. Davis 1961. Some seasonal changes in morphology of the Rufous-sided Towhee. Condor 63: 313–321. Google Scholar

12.

R. Drost 1951. Kennzeichen für Alter und Geschlecht bei Sperlingsvögeln. Ornithol. Merkblätter 1. Google Scholar

13.

W. H. Elder 1955. The relation of age and sex to the weight of Pinkfooted and Grey-lag Geese. Rep. Wildfowl Trust 7: 127–132. Google Scholar

14.

P. R. Evans 1964. Wader measurements and wader migration. Bird Study 11:23–38. Google Scholar

15.

J. Gibb 1954. Feeding ecology of tits, with notes on Treecreeper and Goldcrest. Ibis 96: 513–543. Google Scholar

16.

J. Gibb 1960. Populations of tits and Goldcrests and their food supply in pine plantations. Ibis 102: 163–208. Google Scholar

17.

H. Grimm 1954. Biometrische Bemerkungen über mitteldeutsche und westdeutsche Sperlingpopulationen. J. Orn. 95: 306–318. Google Scholar

18.

S. Haftorn 1951. En undersøkelse over vekt-variasjoner i vinterhalvåret hos Kjøttmeis. Fauna, Oslo, 2: 83–91. Google Scholar

19.

P. H. T. Hartley 1953. An ecological study of the feeding habits of English titmice. J. Anim. Ecol. 22: 261–288. Google Scholar

20.

C. W. Helms , & W. H. Drury Jr , 1960. Winter and migratory weight and fat studies on some North American buntings. Bird-Banding 36: 1–40. Google Scholar

21.

R. A. Hinde 1952. The behaviour of the Great Tit (Parus major) and some other related species. Behaviour Suppl. 2: 1–201. Google Scholar

22.

H. de. Jonge 1958–1960. Inleiding tot de medische statistiek. Leiden. Google Scholar

23.

W. Keil 1962. Gewichte und Masze von im Winter gefangenen Kohlmeisen, Parus major. Luscinia 35: 24–26. Google Scholar

24.

H. N. Kluyver 1939. Über die Variabilität der Flügellänge in einer beringten Parus major-Population. Limosa 12: 80–86. Google Scholar

25.

H. N. Kluyver 1950. Daily routines of the Great Tit, Parus m. major L. Ardea 38: 99–135. Google Scholar

26.

H. N. Kluyver 1951. The population ecology of the Great Tit, Parus m. major L. Ardea 39: 1–135. Google Scholar

27.

H. N. Kluyver 1952. Notes on body weight and time of breeding in the Great Tit, Parus m. major L. Ardea 40: 123–141. Google Scholar

28.

H. N. Kluyver 1957. Roosting habits, sexual dominance and survival in the Great Tit. Cold Spring Harb. Symp. quant. Biol. 22: 281–285. Google Scholar

29.

H. N. Kluyver 1966. Regulation of a bird population. Ostrich Suppl. 6:389–396. Google Scholar

30.

J. Koskimies 1958. Seasonal, geographical and yearly trends in the weight of Capercaillie and Blackgame from Finland. Ornis fenn. 35: 1–18. Google Scholar

31.

J. Lees 1949. Weights of robins. II. Juveniles and adults. Ibis 91: 287–299. Google Scholar

32.

H. N. Leys 1965. Een vegetatiekartering van het Liesbosch. Levende Nat. 68: 63–71, 91–94. Google Scholar

33.

H. Löhrl 1954. Gefiedermerkmale bei einer Population des Halsbandschnäppers (Muscicapa albicollis). Bonn. zool. Beitr. 5: 33–48. Google Scholar

34.

H. Löhrl , & R. Böhringer . 1957. Untersuchungen an einer südwestdeutschen Population des Haussperlings (Passer d. domesticus). J. Orn. 98: 229–240. Google Scholar

35.

J. W. Mascher 1966. Weight variations in resting Dunlins (Calidris a. alpina) on autumn migration in Sweden. Bird-Banding 37: 1–34. Google Scholar

36.

I. Newton 1966. Fluctuations in the weights of Bullfinches. Brit. Birds 59: 89–100. Google Scholar

37.

I. Newton , & P. R. Evans . 1966. Weights of birds in winter. Bird Study 13: 96–98. Google Scholar

38.

M. M. Nice 1938. The biological significance of bird weights. Bird-Banding 9: 1–11. Google Scholar

39.

D. F. Owen 1954. The winter weights of titmice. Ibis 96: 299–309. Google Scholar

40.

C. M. Perrins 1965. Population fluctuations and clutch-size in the Great Tit, Parus major L. J. Anim. Ecol. 34: 601–647. Google Scholar

41.

A. L. Rand 1961. Wing length as an indicator of weight: a contribution. Bird-Banding 32: 71–79. Google Scholar

42.

D. W. Snow 1954. Trends in geographical variation in palaearctic members of the genus Parus. Evolution 8: 19–28. Google Scholar

43.

Staatsbosbeheer. 1955–1964. Oogstverwachtingsbericht voor boomzaden seizoen 1955–1956, etc. Ned. Bosb. Tijdschr. 27: 276; 28: 248; 29: 254; 30: 299; 31: 298; 32: 380; 33: 310; 34: 415; 35: 418; 36: 336. Google Scholar

44.

I. F. Stewart 1963. Variation of wing length with age. Bird Study 10: 1–9. Google Scholar

45.

E. Sutter 1946. Die Flügellänge junger und mehrjähriger Gründfinken und Gartenrötel. Orn. Beob. 43: 81–85. Google Scholar

46.

S. Ulfstrand 1962. On the non-breeding ecology and migratory movements of the Great Tit (Parus major) and the Blue Tit (Parus caeruleus) in Southern Sweden. Vår Fågelvärdl Suppl. 3: 1–145. Google Scholar

47.

R. Verheijen 1956. Les longueurs de l'aileron et de la queue en relation avec l'age des oiseaux. Gerfaut 46: 65–74. Google Scholar

48.

A. Wolfson 1945. The role of the pituitary, fat deposition, and body weight in bird migration. Condor 47: 95–127. Google Scholar