ON BIRDS OBSERVED IN THE ISLAND OF TIREE 161 



LITTLE AUK, Mergulus alle. A few come ashore dead in winter, 

 some of which are quite fresh. I have never seen a living one 

 round the coast. 



BLACK GUILLEMOT, Uria grylle. Not numerous, but a few pairs 

 breed on the island. 



PUFFIN, Fratercula arctica. Common during summer round the 

 coast, but it does not breed here. 



GREAT NORTHERN DIVER, Colymbus glacialis. Fairly common round 

 the coast. It returns here from its breeding-grounds as early as 

 the end of August. 



BLACK-THROATED DIVER, Colymbus arcticus. A few to be seen round 

 the coast in spring ; rare at other times. 



RED-THROATED DIVER, Colymbus septentrionalis. Fairly common 

 round the coast, especially during autumn. It does not breed 

 here. 



GREAT- CRESTED GREBE, Podicipes cristatus. Occurs occasionally. 

 I have seen a pair as late as the month of April on Loch 

 Vasapol. 



SLAVONIAN GREBE, Podicipes auritus. Common during winter and 

 spring. It frequents the lochs mostly, but it is sometimes to 

 be seen on the sea. 



LITTLE GREBE, Podicipes fluviatilis. Fairly common, though never 

 numerous. It frequents the lochs, and goes to the sea during 

 hard frost. 



FULMAR, Fulmarus glacialis. Not uncommon. I have caught 

 examples several times, which seemed to be unable to rise off 

 the flat ground, although their wings appeared to be uninjured. 



GREAT SHEARWATER, Puffiiius major. Very rare. I found one 

 dead on the " Reef " in October 1891 ("Annals," 1892, p. 74). 



MANX SHEARWATER, Puffinits anglorum. Is sometimes very common 

 round the coast, while at other times there are none to be seen. 



FORKED-TAILED PETREL, Occanodroma leucorrhoa, I once found a 

 bird of this species which had killed itself by flying against the 

 telegraph wire. 



STORM PETREL, Procellaria pelagica. Not uncommon round the 

 coast during summer. I have seen it at Kennavara Head 

 during the breeding season, and I think it may perhaps breed 

 there. 



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