126 



ANIMAL BIOLOGY 



inconceivable numbers of destructive Insects and weed seeds. 

 (Figs. 236, 239, 266.) 



Fig. 86. — Carinate Birds. A, Penguin, Eudyptes chrysocoma; B, Stork, 

 Ciconia alba; C, Hummingbird, Eulampis jugularis; D, Woodcock, Scolopax 

 rusticula; E, Parrot, Psitlacus erithacus. (From Newman, after Lydekker 

 and Evans.) 



E. Mammals 



With the class Mammalia we reach the highest forms of life 

 on the Earth, culminating in Man, so here naturally our interest 

 is chiefly focussed. But since considerable attention is to be given 

 a little later to their anatomy and physiology with special reference 

 to the human body, only the essential Mammalian characters and 

 classification are now in ooint. 



In brief, Mammals are warm-blooded, lung-breathing, hairy 

 Vertebrates. The young of all but the very lowest Mammals 

 develop before birth at the expense of food derived from the 

 mother's blood. All immediately after birth receive milk from 

 special mammary glands. Mammals are classified under three 

 main subdivisions: Monotremes, Marsupials, and Placentals. 



