I30 



ANIMALS OF LAND AND SEA 



the same way climb through the air. One bird, the hoactzin, 

 when young dimbs actively about the bushes with its fore 

 Hmbs which, as in many other birds, have claws; when fully 



grown it climbs 

 through the air like 

 any other bird. 



The wings of fly- 

 ing fishes do not dif- 

 fer from the corre- 

 sponding fins of 

 other fishes except 

 in their greater size. 

 Besides the ani- 

 mals which fly by 

 their own efforts 

 there are many 

 others which at some 

 period of their exist- 

 ence, usually when 

 young, are wafted 

 through the air with- 

 out 'the aid of flying 

 organs just as the 

 seeds of many plants 

 are blown about. 



Chief among these 

 are the flying spi- 

 ders. Many differ- 

 ent kinds of spiders 

 have hit upon this 

 means of getting 

 from place to place. 

 It is usually, though not invariably, the young spiders that do 

 this, and the phenomenon is best observed on warm and com- 

 paratively quiet autumn days when there is a good updraught 

 of wind. The spiders climb to the summit of some object, such 



Figs. 299-312. Various Flies. 

 For explanations of the figures see p. xx. 



