Family BUBONIDAE. 



Asio otus (L.) Long-eared Owl. 



(Plate 96, fig. a-c). 

 (Snouckaert: Avifauna Neerlandica, p. 61, No. 146). 



Colour of surface of shell: 

 Average dimensions: 

 Average weight of shell: 

 Texture of shell: 

 Shape : 

 Nest: 



Site of nest: 

 Number of eggs: 

 Breeding season: 

 Duration of incubation: 

 Remarks : 



white. 



40X32.2 millimetres. 



1.57 gram. 



see the general review of the Family. 



varies between rounded and oblong oval. 



this species generally uses deserted nests of 

 Crows, Birds of Prey, Doves or Squirrel- 

 dreys. 



see above. 



4—7, mostly 5—6. 



April— beginning of July. 



3—4 weeks. 



Amongst these eggs there are some which 

 remind us to some extent of those of 

 flammca; they are, however, rounded off 

 more equally at the two ends; the pecu- 

 liar character of the granulation of the 

 latter species excludes confusion in every 

 case. 



