Family CORVIDAE. 

 Corvus monedula L. — Jackdaw. 



(Plate 3, fig. a-d). 

 (Snouckaert: Avifauna Neerlandica, p. 8, No. 5). 



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: 



bright bluish green; bluish or greenish white. 



olive brown; dark brown; yellowish grey; 

 when lying deeper they have a light grey 

 appearance. 



34 X 25 millimetres. 



0.763 gram. 



has no special characteristic, 



ovoidal. 



consists of twigs, straw and similar material; 

 lined with hair and feathers. 



in colonies, in towers, old buildings, ruins, 

 chimneys, hollow trees, etc.; also amongst 

 rookeries. 



5-6. 



middle of April— end of May. 



about 17 days. 



