ECOLOGY AND BIOLOGY OF THE PACIFIC WALRUS 



37 



i 



I200[- 

 - 1000- 

 ^ 800 



2 600 

 a 



5 400 



200 

 0 



10 15 20 

 Age (years) 



25 >25 



Fig. 22. Length and weight of the baculum of the Pacific walrus in relation to age. Curves 

 were fitted visually. 



Fig. 23. Comparative size and shape of bacula from a Pacific walrus calf (lower) and 

 mature adult (upper). (Photo by F. H. Fay) 



