EVOLUTIONARY ASPECTS IN MAMMALS 



1000- 



a. 800 



600 H 



200 



o o 



38- 



C 34- 



OOD 



oo 



O O 



X 



1^ 



5 10 15 20 



AMBIENT TEMPERATURE °C 



30 



Figure 14. Comparison between oxygen consumption and deep rectal tempera- 

 tures for armadillos smd rabbits at different ambient temperature levels. Open 

 circles indicate rabbit data; crosses and regression line indicate the results 

 from the armadillo experiments. (Johansen, 1961). 



115 



