Family CORVIDAE. 



Corvus corax L. — Raven. 



(Plate 2, fig. a-c). 

 (Snouckaert: Avifauna Neerlandica, p. 7, No. 1). 



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: 



green, in various variegations ; blue (— cyanic) 

 or bluish white (= leucitic objects). 



olive, in various green and brown shades; 

 sometimes a few pitch-black spots on the 

 outermost (glutinous) layer; when lying 

 deeper these have a grey appearance. 



48.36 X 34 millimetres. 



1.955 grams. 



has no special characteristic. 



oblong ovoidal. 



consists of branches and twigs, covered with 

 roots and lumps of earth; lined with moss, 

 grass and wool. 



in the tallest trees. 



4-6. 



beginning of March (sometimes end of Fe- 

 bruary)-April. 



Duration of incubation; 



about 21 days. 



