SEA-BIRD MOVEMENTS I39 



Island (Bertram and Lack, 1933): one was seen at Jan Mayen on 

 21 July 1900 (G.KolthofF, 1901). There are only four certain gannet 

 records for Greenland (Horring and Salomonsen, 1941), three from 

 the south-west coast and one from Scoresby Sound on the east side. 

 Nevertheless the gannet does appear to penetrate Davis Straits a little 

 distance, also sometimes Hudson's Strait, for the Eskimos of Ungava 

 see it occasionally (B. Hantzsch, 1928) and T. H. Manning (1952) 

 saw, in August 1947, three or four birds that he believed to be gannets 

 at the mouth of the Shagamu River, south-west Hudson's Bay. We 

 have one extraordinary (hitherto unpublished) record from the 

 Canadian Arctic beyond Davis Strait, from Jones Sound which enters 

 Baffin's Bay as far north as 75°N. Here, on 23 August 1937, while 

 excavating the old Eskimo village at Cape Hardy on the north coast 

 of Devon Island, T. C. Lethbridge and his companions (who were 

 all familiar with the species) saw several gannets flying in line quite 

 close to them. 



The West Atlantic breeding birds do not disperse in quite the same 

 way as the East Atlantic birds in winter, for the St. Lawrence popula- 

 tion appears to go south for the winter, adults and young together. 

 None goes north: there is no record whatever of any gannets along 

 the Atlantic coast of Labrador from the Straits of Belle Isle to Davis 

 Strait (O. L. Austin, 1932), which suggests that the birds seen in 

 Greenland and the Canadian Arctic may have dispersed there from 

 Iceland or from some other East Atlantic headquarters. In winter 

 gannets are more common off Virginia than off Cape Cod ; the birds 

 range far south into the Caribbean, regularly to Florida and Cuba 

 and into the Gulf of Mexico, occasionally as far as the Mexican coast, 

 and reputedly to Trinidad. So the West Atlantic gannet is a true 

 migrant. The guillemot and even more so the razorbill, Hke the young 

 gannet, are migratory: both enter the Mediterranean and penetrate 

 eastwards as far as Italy and the Italian islands. 



The sea-birds which make the greatest journeys of all are the great 

 and sooty shearwaters which visit us from the southern hemisphere 

 and our own northern-hemisphere-breeding Manx shearwaters, arctic 

 terns, skuas and phalaropes. All cross the open ocean at the Equator 

 on their way to their objectives in the southern hemisphere. Lately 

 it has been proved that the Manx shearwater makes a diagonal migra- 

 tion, from the British Isles to South America (region of Buenos Aires 

 and Rio de Janeiro, where two individuals ringed at Skokholm 

 have been recovered) . Crossing the line of the shearwater migration 



