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 than 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, &e. 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. 
