Family FALCONIDAE. 

 Pernis apivorus (L). — Honey-Buzzard. 



(Plate 106, fig. a-b). 

 (Snouckaerl: Avifauna Neerlandica, p- 71, No. 168). 



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 yellowish or green- 

 ish; when light shines through the egg- 

 shell it shows through more or less yel- 

 lowish green. The cloudy markings are 

 so close that frequently nothing is visible 

 of the colour of the surface of the shell. 



dark red-brown. Usually, every set of eggs 

 consists of one egg coloured almost plain, 

 and of one irregularly marked egg. 



51.8 X 41.6 millimetres. 



3.6 grams. 



fine-grained. 



bellied; often approaches strongly to a 

 spherical shape. 



consists of vegetable materials. (Deserted 

 nests of other species of Birds of Prey, or 

 nests of Corvidac, are also sometimes used 

 as a substructure). 



by preference in leaf-trees, particularly in 

 beeches and oaks. 



2; sets of three eggs have once or twice 

 been found, constituting rare exceptions. 



May— June. 



presumably about 3 weeks. 



