18 



NORTH AMERICAN FAUNA 74 



Fig. 12. Walruses sighted in September (symbols as in Fig. 4). 



Holman Island, Northwest Territories (Harington 1966). To the south on the 

 Siberian coast, walruses have been sighted on Bogoslov Island and in Olyutorskii 

 Bay in the Koryak region (V. N. Gol'tsev, personal communication), and in List- 

 venichnoi and Russkoi bays, Kamchatka (Chugunkov 1970 in Kosygin and 

 Sobolevskii 1971). The southernmost sightings in Alaska were at Amak Island in 

 1979 (J. Sarvis, personal communication). 



October (Fig. 13) 



With abundant formation of new ice, the pack rapidly advances southward in 

 October, and its southern edge frequently is below 70 °N by the end of that 

 month. At the same time, the walruses also advance southward, mainly ahead of 

 the ice, and to judge from the distribution of sightings in this and the previous 

 month, possibly in two or three "waves." Apparently, the first to arrive in Bering 

 Strait are those that have summered along the northern coast of Chukotka. 

 Those summering in the Barrow and Wrangell Island regions appear to remain 

 there somewhat longer. 



Enormous herds of southbound migrants congregate on the hauling grounds in 

 Bering Strait and on the Funuk Islands, just east of St. Lawrence Island. At the 

 same time, large numbers have appeared in the vicinity of Nunivak and Nelson 

 islands, on the Alaskan coast, presumably having swum there from the north. 

 The herds that have summered in the northern part of the Gulf of Anadyr desert 

 the Meechken and Rudder hauling grounds usually in late September, but a large 



