Family FRINGILLIDAE. 



Passer montana (L.) — Tree-Sparrow. 



(Plates 20-21, fig. a— h). 

 (Snouckaert: Avifauna Neerlandica, p. 19, No. 34). 



Colour of surface of shell 



Colour of spots; 



Average dimensions: 

 Average weight of shell; 

 Texture of shell: 

 Shape : 



Nest: 



Site of nest: 



Number of eggs: 

 Breeding season: 

 Duration of incubation : 



white, sometimes slightly greenish, completely 

 covered by the very full cloudy markings. 



grey; greyish brown; reddish brown. 

 Almost without exception every set of eggs 

 contains at least one which differs from the 

 others, the cloudy markings being replaced 

 by a few large spots which leave a portion 

 of the light coloured shell surface unmarked. 



19.5 X 13.9 millimetres. 



0.159 gram. 



strong. 



mostly short ovoidal. 



consists of the same material as that of which 

 the House-Sparrow's nest is built. 



by preference in hollow trees; also in holes 

 in walls, and similar cavities; sometimes 

 under roofs. 



5—6, sometimes 7 (after-set : 4—5). 



end of April— July. 



about 13 days. 



