THE BIRD-LIFE OF LONDON 
taken to conceal it. It is made of dry grass chiefly, 
mixed with roots, dead leaves, moss, and sometimes a 
few twigs, lined first with wet mud, and finally with wet 
decayed wood. ‘The eggs are four or five in number, 
turquoise blue, spotted with very dark brown and grey. 
Both sexes incubate, and frequently several broods are 
reared in the season. ‘To some extent this Thrush is 
migratory, leaving certain districts entirely during winter, 
a fact attributable probably to its animal diet, for like 
the Redwing it shows small partiality for berries. 
The adult Song Thrush has the general colour of the 
upper parts olive-brown, the wing-coverts tipped with 
buff; the under parts are white, more or less suffused 
with pale buff, most pronounced on the flanks and breast ; 
the under surface of the wings is golden buff; most of 
the under surface is spotted with black. Bill dark brown, 
paler at the base of the lower mandible ; tarsi and toes 
yellowish brown; irides brown. Length about g inches. 
The nestling is profusely mottled and spotted on the 
upper parts with buff. 
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