108 THE ORNITHOLOGIST'S GtJIDE 



Black-headed Gull. — This bird is not plentiful in 

 either country ; a few pairs regularly resort thither 

 during the breeding-season, and make their nests 

 on the small islands in the lakes which are conti- 

 guous to the sea, generally selecting those which 

 are in the neighbourhood of deep bogs, on the 

 gravelly shores of which they are frequently to 

 be met with. In Orkney I have found their 

 nests in a lake near Nunse Castle, and in an- 

 other on the Isle of Sanda. In Shetland they 

 are most numerous in a lake at the back of Rona's 

 Hill. 



Larus CanuSj Linn. Maw*. Common Gull, 

 • — During the summer season this bird is the 

 scarcest of the Gull tribe in these islands. I have 

 found a few pairs incubating in company with the 

 Herring Gull, and occasionally a solitary pair 

 breeding in the cliffs without any associates ; 

 they may be found occasionally on the small is- 

 lands in the lakes. The female generally lays 

 three eggs. 



Larus Rissa, Linn. Kittiwake. — The Kit- 

 tiwakes are migratory : during the summer season 

 they are by far the most numerous of the Gull 

 tribe. They select the bold rocky headlands in 



