324 



ANIMAL BIOLOGY 



Mammals fitted for all sorts and conditions of the environment — 

 representatives are competing with members of other groups be- 

 neath, on, and above the earth and in the water. Somewhat sim- 



Fig. 207. — A, 'Flying Lemur,' Galeopithecus volans; B, Bat, Vespertilio 



nodula. (From Lull.) 



ilar adaptive radiations are traceable in other animal groups, espe- 

 cially the Insects, though there seems no doubt that the adapta- 

 bility of the Mammalian stock — its potential of evolution — is in 



Fossorial 



Aquatic-Volant 



Fossorial-Volant 



Shore forms 



AmbulaWy-Volant 

 'Stem 



Water-striders 

 (Volant: 



Water-striders 

 (Non-volant,) 



Ambulatory 

 (Non-volant) 



Fig. 208. — Diagram of the adaptive radiation of a group of Insects, the 

 Hemiptera, or Bugs. (From Lindsey.) 



no small degree responsible for the dominant position which the 

 Mammals hold in the animal world of to-day. Man is a Mammal. 

 (Figs. 85, 208.) 



Animal Coloration. Perhaps the most generally striking 

 characteristic of organisms is their color and color pattern. Among 



