IO S THE ANIMAL KINGDOM. 



as the Penguin, whose legs are placed so far behind that 

 the animal moves about in an upright position, the wings 

 being so small that it cannot fly. When in the water, 

 however, these wings are used pretty much like the fins of 

 a fish ; and we find others, such as the Albatross, whose 

 wings are of enormous size. 



The Albatross is one of the largest of aquatic birds. 

 Its wings, when spread out, measure fourteen feet, and it 

 weighs twenty pounds. 



The Frigate bird, too, has wings of nearly the same 

 extent, and is found playing the tyrant of the sea, and 

 carrying on a life of rapine at a thousand miles from 

 shore. 



To this order belong all the birds included in the 

 various families of Ducks, Divers, Auks, Gulls, and 

 Pelicans. 



REPTILES. 



REPTILES are animals which crawl or creep. Some of 

 them have legs, and others have not ; but the limbs of 

 such as possess them arc not as efficient for walking 

 purposes as in the Mammalia, for they are not placed in 

 an upright manner, but in most cases turn outward from 

 the body, or arc short and stunted, so that the animal 

 may be said to shamble rather than walk along. The 

 circulation in reptiles is said to be " incomplete," because 

 in general their heart has but three cavities instead of 

 four, and only a portion of the blood which has been 

 returned from the various parts of the body is sent to the 

 lungs to be purified, but the principal part of it passes 

 again in its impure condition into the system ; thus it is 

 not warmed. Reptiles are, therefore, called cold-blooded 

 animals, and, having no warmth which requires keeping 



