178 

 MAMMAL SPECIES ACCOUNTS 



Information on range and the maximum sizes of the animals are given in the 

 following species accounts. Such information was excluded from the keys 

 because unless considered carefully, it can be very misleading. If the 

 anirr.al you are keying out is say, 10 m long, then you can rule out those 

 species in which maximum length is much less than that. You oan not 

 rule out animals that attain a greater maximum length because, and often 

 quite likely, you may be trying to identify a juvenile or subadult. In 

 some instances we can offer information on minimum lengths (at birth). 

 Another difficulty with size in marine mammals, especially pinnipeds, is 

 that males and females can be greatly different in size. Information on 

 size comes from Scheffer (1958) and Leatherwood et al. (1972). 



SEA LIONS AND FUR SEALS (OTARIIDAE) 



NORTHERN (or STELLER) SEA LION (Ewnetopias jubatus; choices 7' and 8', 

 pg. 164) occurs from southern California north to the Bering Strait. Males 

 reach a length of 3.2 m and a weight of 1000 kg; females reach 2.3 m and 

 275 kg. At birth, pups are about a meter long and weight about 18 kg. 



CALIFORNIA SEA LION (Zalophus oaUfomianus; choices 7 and 8, pg. 164) 

 occurs from Cabo San Lucas north to British Columbia; females rarely move 

 north of central California. Males reach a length of 2.4 m and a weight 

 of 280 kgj females reach l.Smand 95 kg. At birth pups are less than a 

 meter long. 



GUADALUPE FUR SEAL (Arotoeephalus toimsendi; choice 9, pg. 164) 

 occurs principally off central Baja California and less so north to southern 

 California. Individuals have occasionally been sighted north to central 

 California. Its population is exceedingly small compared to those of the 

 sea lions or the Northern Fur Seal. Males reach a length of 2.6 m and a 

 weight of 300 kg; females reach 1.8 m and 125 kg. Pups are less than a 

 meter long. 



NORTHERN FUR SEAL (Callorhinus ursinus; choice 9', pg. 164) occurs 

 from the Bering Sea south to southern California. Males reach a length 

 of 2.2 m and a weight of 280 kg; females reach 1.5 m and 65 kg. Pups 

 are less than a meter long. 



WALRUS (ODOBENIDAE) 



WALRUS (Odobenus rosmarus; choice 4, pg.160) occurs principally in 

 the Bering Sea although very rarely individuals have been reported as 

 far south as British Columbia. Males reach a length of 3.7 m and a 

 weight of 1300 kg; females reach 3 m and 850 kg. Pups are about a 

 meter in length. 



