It) ELEMENTS OF ORNITHOLOGY. 
another group of Birds containing about thirty-five species, 
which are exclusively Old-World in distribution. One of them 
is the Rose-coloured Starling or Pastor (Pastor roseus), which 
has been often shot in England, though it can only be regarded 
as one of the accidental visitors to our shores, whereof it is one 
of the handsomest. Starlings may often be seen perched on 
the backs of sheep or oxen, which they benefit by extracting 
from them ticks and other parasitic pests. Another species of 
Fig. 120. 

The Pastor (Pastor roseus). 
Bird, however, called the Beef-eater or Oxpecker (Buphaga 
erythrorhycha), found in South Africa, similarly perches on the 
backs of cattle for parasites, especially the grubs, or larvee, of 
a fly (Estrus). In extracting these, however, it 1s apt to pro- 
duce bad sores. There are two species of this genus. 
A Bird is often to be seen in our Zoological Gardens which 
is pretty sure to attract attention by the eye or the ear, 
or by both. It attracts the eye by its conspicuous bright 
