

me of Poh age. 
Figure 2.--Male walruses on the Walrus Islands.(Photo by Kenyon) 
In April the northern movement becomes more purposeful. 
According to Fay (1955), the advance guard is wholely males, usually in 
groups of 2 to 10 individuals. He further states, on the basis of infor- 
mation provided to him by Ryder (in litt.), that the southernmost extremes 
of range have also been recorded at this time, presumably as a result of 
southward drift of isolated floes of ice. 
By May the major northward movement is well under way, including 
the females and young. At this time the combination of weather factors is 
such that the major drift of ice is northward. By the end of the month 
movement through Bering Strait is well under way. Fay (1955) states that 
the animals passing through the Strait of Anadyr are principally females 
accompanied by juveniles and newborn young, but that there are a few adult 
bulls among them. To the north of St. Lawrence Island, within 15 miles of 
the Island, the population is nearly all bulls. Passage of large groups 
of walruses through the Bering Strait begins during this month, with pas- 
sage beginning on the west side; walrus herds are seldom evident to the 
east of the Diomede Islands until after the middle of May. This pattern 
