7O ELEMENTS OF ORNITHOLOGY. 
bank, wherein is its foul bed of rejected fish-bones. Very 
different is the comfortable abode—domed-shaped and formed 
of moss and dry grass—of the Dipper (Cinclus aquaticus), which 
also haunts our mountain streams, even passing much of its time 
under water searching for the small creatures on which it feeds. 
Fig. 72. 

The Great Black Woodpecker (Picus martius). 
In rapid, rocky rivulets it is to be found in England all the year 
round. It represents a group of about a dozen species of 
similar habits found in both worlds, mainly in the Northern 
Hemisphere. 
The Dipper, unlike the Kingfisher, does not perch on trees, 
