Family ALAUDIDAE. 

 Alauda arvensis L. — Sky-Lark. 



(Plate 27, fig. a-e). 

 (Snouckaert: Avifauna Neeriandica, p. 23. No. 48). 



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: 



greenish grey; brownish; yellowish or red- 

 dish white. 



brown; when lying deeper they are of a 

 dark grey appearance. The markings mostly 

 bear a cloudy character and cover the 

 eggshell all over. 



22.8 X 16.4 millimetres. 



0.188 gram. 



bears no specific characteristic. 



when cut transversely very unequal halves 

 are produced. 



consists of vegetable materials, lined with 

 some horsehair. 



in a little hollow in the ground, in meadows 

 and arable land. 



usually 5 (after-set: 3—4). 



April— July (sometimes August). 



about 14 days. 



