230 THE HORSE AND ITS RELATIVES 



that have been produced between different members 

 of the horse family is available, it appears that 

 crossing has taken place between nearly all of them. 

 Unfortunately, there is very little information with 

 regard to the fertility or sterility of the hybrids, 

 except in the case of the mule and the kiang. 

 There are, however, some undoubted instances of 

 partial fertility in the hybrids ; one of the best 

 known being a hybrid between the zebra and the 

 wild ass born many years ago at Knowsley Park, 

 the seat of the Earls of Derby, which gave rise to 

 offspring when crossed with a bay pony mare. 



On some of the farms of Cape Colony individuals 

 of the true zebra are occasionally allowed to run 

 with domesticated donkeys, with which they may 

 interbreed. In 1896 I received a photograph of 

 a foetus apparently belonging to a hybrid of this 

 nature, sent by Mr. F. W. FitzSimons, director 

 of the Port Elizabeth Museum. The specimen 

 which is mounted in that museum was prematurely 

 born, but is fully developed, even to the harden- 

 inor of the hoofs. Whereas, however, the limbs 

 are transversely banded with black in the same 

 fashion as in the zebra, the colouring of the 

 body is of a totally different type. The ground- 

 colour is a warm buff, lightest on the limbs. The 

 whole of the neck is marked with a great number — 

 many scores — of very narrow, vertical black lines, 

 totally different from the broad black stripes of 



