44 STUDIES IN BIRD-MIGRATION 



Levantine Shearwater, Puffijins yelkoumuis. 

 Little Dusky Shearwater, P. hnilloni. 

 Capped Petrel, CEstrelata /uesitata. 

 Collared Petrel, CE. hrevipes. 

 Schlegel's Petrel, ffi. neglecta. 

 Bulwer's Petrel, Buhveria buhve?-i. 



Ireland. — All these phases of migration are observed 

 in the Sister Isle. Ireland, too, has a great bird- 

 population, of which a considerable section is migratory, 

 and much migration is witnessed on her shores. She 

 is not favoured to the same extent as Great Britain so 

 far as the numbers of her Summer Visitors are con- 

 cerned ; nor do her shores lie as directly in the course of 

 so many Birds of Passage ; nor, again, thanks to her 

 milder climate, are there so many migratory individuals 

 (Partial Migrants) to be found in the ranks of her 

 resident species. On the other hand, in addition to a 

 considerable number of Winter Visitors from Northern 

 Europe she receives in autumn, thanks again to her 

 more genial climate, a great number of winter guests 

 from less favoured portions of the British Area — such as 

 Song Thrushes, Blackbirds, Chaffinches, Starlings, Sky- 

 larks, Lapwings and others ; while in seasons of severe 

 cold or much snow, her hospitable shores, especially 

 those of the west, afford the safest retreats in our area. 



The movements of these several groups of migrants 

 may be thus summarised under their seasons : — 



Spring. 



1 . Local movements from British winter retreats to British summer haunts. 



2. The return from their continental winter quarters of the Partial 



Migrants. 



3. The arrival in our islands from their southern winter retreats of 



Summer Visitors. 



