140° 160° 180° 160° 140° 120° 
SUMMER RANGE 
3 Early fe Pe, 
{100 Present 
© Early extremes 
@ Present ,, 


170° 180° _ 170° 160° 150° 140° 
Figure 1.--Present and past summer distribution of the Pacific walrus (adapted from Fay, 1957). 
