Family CORVIDAE. 



Corvus corone L. — Crow. 



(Plate 4, fig. a-d). 

 (Snouckaert: Avifauna Neerlandica, p. 8, No. 3). 



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: 



green in various variegations; blue (= cyanic) 

 or bluish white (= leucitic objects). 



olive, in various green and brown tints; 

 sometimes a few pitch-black spots on the 

 outside (glutinous) layer; when lying deeper 

 these are of a grey appearance. 



42.13 X 29.7 millimetres. 



1.28 grams. 



has no special characteristic. 



varying between short oval, oblong oval or 

 ovoidal. 



consists of twigs, roots, stalks, and earth or 

 clay; lined with moss, hair, wool, feathers, 

 rags, etc. 



by preference in lofty trees; in the absence 

 of tall trees, e. g. in dunes : on the ground 

 itself. 



4-6. 



April— May. 



about 20 days. 



