EVOLUTIONARY ASPECTS IN MAMMALS 



Normal Rate 



Modification at 40 C 

 Slight Marked 



Slow Echidna Bandicoot 



(20-30/min) Platypus 



Bilby 

 Man 



Moderate Tas. Devil Gliders 



(60-120/min) Cuscus Possums 



Water rat Koala 



White rat Wallabies 



Monkey Wallaroo 



Kangaroos 

 Rabbit 

 Fruit bat 

 Cat 

 Dog 

 Pig 

 Sheep 



CO'W 



Fast Sugar glider Mars, nnice 



( ^150/min) White mouse Mars. 



Naked-tail rat Nat. cd 



Field rat 

 Mars, rat 



Table II. Comparison of respiratory response in mammals at 40° 

 C. From Robinson and Morrison, 1957. 



89 



