HABT 



iniULflTION 



C5 lOTTon 



WflTTrDM2y37« 



CAKlBOU 



CAL/n'/I'iHBb'i'CCjR 



DflLL SHtEP 



WOLT 

 »/ GRIZZLY BtRR 



POLAR BCftB, 



ICE WftTflP, 



Figure 2. Insulation in relation to winter fur thickness in a series of arctic 

 mammals. The insulation in tropical mammals is indicated by the shaded area. 

 From Scholander et al., 1950. 



206 



