ORIGIN OF DOMESTICATED ANIMALS 229 
musimon). These are all horned sheep from which such a breed 
as the Merino might have descended with no more change than 
is often effected in domestication. 
From these wild types the species shade off into the blue 
sheep of Tibet and the Barbary sheep, with its wealth of long 
hair on its throat and legs, and its horselike tail, but standing 
between the sheep and the goat, as the musk ox stands between 
Fic. 45. Domestication complete. A wild mountain animal brought to the 
lowlands and ready to follow the call of man 
the cattle and the sheep. From here on are a sheer multitude 
of more or less distantly related species, — goats, ibex, markhor, 
tahr, nilgiri, goral, serow, chamois, eland, kudu, antelope, nyl- 
ghau, gemsbok, gazelle, springbok, puku, klipspringer, llama, 
alpaca, and scores of others down to the gnu, or wild beast with 
the horn of a musk ox, the head and mane of a bison, the tail 
of a horse, and body and legs midway between the horse and 
the cow. 
