WEST 



I 4 PIGEONS 



FASTED 



X ^ — -^^^ 



29* TO 32* ffi-ts^ 



/ 10* TO id 



HI 2 SISKINS 



«o^ FASTED 



2000^0 



,.„„ ° \o -3*T0 10* 



■»v ^ ^9'T0 3Z' 

 1000 •-«r' 



5000 

 4000 

 3000 

 2000 

 1000 



5000 

 4000 

 3000 

 2000 

 1000 



12 \^i^ 



30 35 40 



30 35 40 





-14' TO -4' 



14* TO 18* 



29* TO 32- 



-20 -10 10 20 30 40 



_ «24"^-. 2 EUROPEAN GOLD- 



' ~~^-.°«rt FINCHES 



°S7 FASTED 



301 



I5*T0 23' "^V^FJ 



-10 10 20 30 40 



V -2' TO 10* 



-20 -10 10 20 30 40 -20 



TEMPERATURE 



-10 10 20 30 40 



Figure 11. Temperature- metabolism curves of birds acclimated to warm (•) 

 and cold (O). Gelineo's data replotted by Hart (1957). 



308 



