GEOCICHLA. 



199 



are not tropical — one breeding in "Western North America, and two in 

 Eastern Siberia. Of these latter, individuals occasionally take the wrong 

 route of migration in autumn, and wander into Europe, sometimes as far 

 as our islands. 



The Ground-Thrushes are 'par excellence ground-Thrushes, and frequent 

 trees and shrubs far less frequently tlian the Thrushes or Ouzels. They 

 haunt dense groves and jungles^ as well as the ground in the open parts of 

 the woodlands. These birds possess considerable powers of song. Their 

 food consists of worms, grubs, insects, fruits, berries, &c. They all build 

 open nests, made of dried grasses, rootlets, moss, and mud, placing them 

 at various heights from the ground in trees and bushes. Their eggs, three 

 to five in number, vary from pale bluish green to dark bluish green in 

 ground-colour, spotted and freckled with rufous-brown. 



