THE TRAVELS OF BIRDS 



it was never necessary for him to fly, he might, 

 in time, wholly lose the use of his engine and 

 be unable to fly. Indeed this has happened to 



GREAT AUK. 



The Great Auk was flightless (note its small wings). It was 

 therefore a stay-at-home among birds, and being unable to 

 escape was killed by fishermen for its flesh, feathers, and oil. 

 It is now extinct, none having been seen since 1842. Compare 

 the Great Auk's "engines" with those of the Man-of-War Bird, 

 figured on page 143. 



some birds of the Rail and Gallinule family. 



They have lived so long on islands, where they 



never had to fly, that their wings have become 



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