JO HANS EN 



regulate deep body temperature in the marsupial (Setonix sp.) is 

 equally as efficient as that displayed by many placental mammals 

 of similar size. The ability to regulate even extends to air tem- 

 peratures below and above those ever encountered in the animal's 

 natural habitat. Under' severe positive heat loads, both sweating 

 and panting was decidedly less important than copious salivation 

 and licking. This seems to be a general specialization within the 

 marsupial order; it has been demonstrated by Robinson and 

 Morrison (1957), and others. Bartholomew points out that this 

 very effective mechanism for facilitating heat loss is a specialized 



o 



(r 



UJ 

 Q 



40 



30 



20 



10 



10 



DEEP' BODY 



/DRY BULB 

 '■4« AIR 



20 40 60 80 100 120 140 160 180 

 MINUTES 



Figure 7. The response in body temperature o£ an adult Setonix sp. to an air 

 temperature much low^r than that which ever normally occurs m its environment. 



94 



