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ANIMAL BIOLOGY 



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Fig. 239. — A few varieties of domestic Pigeons. Over one hundred and 

 fifty different breeds have been derived by selection from the wild Blue-rock 

 Pigeon, some of which "differ fully as much from each other in external 

 characters as do the most distinct natural genera." (Darwin.) 1, Blue-rock 

 Pigeon, Columba livia, ancestral form; 2, homing; 3, common mongrel; 4, arch- 

 angel; 5, tumbler; 6, bald-headed tumbler; 7, barb; 8, pouter; 9, Bussian 

 trumpeter; 10, fairy swallow; 11, black-winged swallow; 12, fantail; 13, car- 

 rier; 14, 15, bluetts; bird between 14 and 15, a tailed turbit. (From photo- 

 graph of an exhibit in the United States National Museum.) 



