Kumari, E. 1979. Moult and migration of waterfowl in Estonia. Wildfowl 30: 

 90-98. 



Lipsberg, Yu. K. 1979. [Number and distribution of the Mute Swan ( Cygnus 

 olor ). ] Ornitologiya 14: 126-123. [In Russian.] 



Nebrig, H. 1979. Kleine Beobachtungen am Hockerschwan , Cygnus olor . Beitr. 

 Vogelkd. 25: 126-127. [In German.] 



Northcote, E. M. 1979. Determination of age and sex of long bones of Mute 

 Swan Cygnus olor . Ibis 121: 74-80. 



Schmidt, R. , A. Seifke and H. Porner. 1979. Mitteleuropaische Subareale des 

 Hockerschwans ( Cygnus olor ) nach Beringungsergenissen aus dem Gebiet der 

 DDR. [The central European distribution of the Mute Swan Cygnus olor 

 based on East German ringing data.] Beitr. Vogelkd. 25: 50-64. [In 

 German. ] 



Simpson, V. R. , A. E. Hunt and M. C. French. 1979. Chronic lead poisoning in 

 a herd of Mute Swans. Environ. Pollut. 18: 187-202. 



1978 



Breucker, H. 1978. Macrophages, a normal component in seasonally involuting 

 testes of the swan Cygnus olor . Cell Tissue Res. 193: 463-471. 



Elderud, C. 1978. Knolsvankull fotvander atta kilometer. [Long-distance walk 

 by a brood of Mute Swans Cygnus olor . ] Var Fagelvarld 37: 136-137. [In 

 Swedish with English summary.] 



MacDonald, J. W. , D. Lea and G. A. Hamilton. 1978. Parasitic worms causing 

 deaths of Mute Swans. Brit. Birds 71: 358-359. 



Plant, C. W. 1978. Differing reactions of adult Mute Swans to intruding 

 juvenile. Brit. Birds 71: 181. 



Ranftl, H. and H. Utschick. 1978. Sestand und reproduktion des Hoeckerschwans 

 in Bayern. [Status and reproduction of the Mute Swan in Bavaria.] J. 

 Ornithol. 119: 238-239. [In German.] 



Utschick, H. 1978. Der Bestandstrend des Hockerschwans ( Cygnus olor ) in Sud- 

 bayern in Abhandgigkeit van der Stichprobengrosse . [Population trend of 

 of the Mute Swan Cygnus olor in southern Bavaria independent of sample 

 size.] J. Ornithol. 119: 191-196. [In German with English summary.] 



1977 



Norman, D. 0. 1977. A role for plumage color in Mute Swan ( Cygnus olor ) par- 

 ent-offspring interactions. Behaviour 62: 314-321. 



Potter, E. F. 1977. The Mute Swan in North Carolina. Chat 41: 95-96. 



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