1902-3.] The Wild Horse (Equus prjevalskii). 
463 
Matopo,” used in my telegony experiments. In the case of her 
Kiang hybrid the period of gestation was 335 days (one day short 
of what is regarded as the normal time), but she carried her 1900 
.zebra hybrid 357 days, three weeks beyond the normal time. 
The Exmoor-zebra hybrids are as nearly as possible intermediate 
between a zebra and a pony ; the Kiang hybrid, on the other hand, 
might almost pass for a pure-bred wild ass. 1 In zebra hybrids the 
ground colour has invariably been darker than in the zebra parent ; 
but the Kiang hybrid is decidedly lighter in colour than her wild 
sire, while in make she strongly suggests an Onager — the wild 
ass so often associated with the Kunn of Cutch. Alike in make 
and colour the Kiang hybrid differs from a youug Prjevalsky foal. 2 
I have never seen a new-born wild horse; but if one may judge 
from the conformation of the hocks, from the coarse legs, big joints, 
and large head of the yearlings — from their close resemblance to 
dwarf cart-horse foals, — it may be assumed they are neither 
characterised by unusual agility nor fleetness. The Kiang hybrid, 
•on the other hand, looks as if built for speed, and almost from the 
moment of its birth it has by its energy and vivacity been a source 
•of considerable anxiety to its by no means placid Exmoor dam. 
When four days old it walked over twenty miles ; on the fifth day, 
instead of resting, it was unusually active, as if anxious to make 
up for the forced idleness of the previous evening. In the hybrid 
the joints are small, and the legs are long and slender and covered 
with short close-lying hair. In the wild horse the joints are large 
and the ‘ bone ’ is round as in heavy horses. 
As to its colour, it may be especially mentioned that the hybrid 
has more white around the eyes than the wild horse, but is of a 
darker tint along the back and sides and over the hind quarters. 
Too much importance, however, should not be attached to differences 
in colour ; for though the two hybrid foals which have already 
arrived closely agree in their coloration, subsequent foals may 
differ considerably, and it is well known that young wild horses 
irom the western portions of the Great Altai Mountains differ in 
tint from those found further east. 
1 In Mendelian terms, the Exmoor pony proved recessive , the wild ass 
dominant. 
‘ 2 For a skin of a very young Prjevalsky foal I am indebted to Mr Carl 
Hagenbeck of Hamburg. 
