igG SEA-BIRDS 



thousands of pairs, and also between Skokholm and Lundy (forty-three 

 miles distant), which has only a small colony. This interchange would 

 have the effect of ensuring specific uniformity in the shearwater popu- 

 lation of the Bristol Channel islands, which in fact is the case. Further 

 ringing is desirable to discover if there is an interchange of young shear- 

 waters of the Pembrokeshire islands with those of the Isles of Scilly and 

 the Irish breeding colonies, for it is only by such evidence that the 

 wanderings of the immature individual^ and the extent of its 

 community, may be known. 



