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CHAPTER XXIV. 



The Terns. The Petrels. The Great Shearwater. The Manx Shear- 

 water. Seafowl off the Coast of Norway. Methods of Capturing 

 them and their Eggs. 



THE Caspian tern (Sterna caspia). This bird makes 

 its appearance on the west coast of Norway in May, 

 and migrates in the autumn. It forms its nest on the 

 bare rock, and lays two or three eggs, of a pale gray 

 colour, tinged with green, and covered with black and 

 brown spots. 



The Sandwich tern (S. cantiaca) is only a rare visitor 

 here. 



The common tern (S. hirundo) is common every- 

 where in the north, as well as in the south. It is 

 called here the almindelig terne, or common tern, and 

 also makrel terne, or mackerel tern, for it follows the 

 shoals of mackerel, in pursuit of the small fishes and 

 marine insects which make for the surface of the 

 water as the mackerel pass under them. 



The roseate tern (8. Dougallii) is merely a casual 

 visitor to this country ; it has been seen, however, in 

 Norwegian Lapland. Its habits are but little known 



