INTRODUCTION. 81 
red colour on the wing, which can be washed away with soap 
and water. This colour is due to the presence of a pigment 
which has been termed ‘ Turacine,” which has been shown to 
contain copper. 

The Green Tody (Zodus viridis). 
About eight species of fruit-eating Birds are known as 
Colies, and they are also exclusively inhabitants of Africa. Here 
we again meet with a crested head, but their long tail amply 
serves to distinguish them from the Plantain-eaters. The 
White-backed Coly (Colius capensis) is not uncommon in 
G 
