THE BIRD-LIFE OF LONDON 
Warblers, bits of cobweb and cocoons are used to bind the 
materials together. ‘The five or six eggs are white, some- 
times suffused with blue or red, in ground colour, clouded 
and blotched with various shades of brown and grey, and 
occasionally scratched with very dark brown. Both sexes 
incubate, and the sitting bird frequently shows great 
fearlessness at the nest. 
The adult male Blackcap has the forehead and crown 
jet-black, the remainder of the upper parts grey, suffused 
with olive on the quills and tail; the under parts are 
pale bluish grey, becoming nearly white on the abdomen. 
The female resembles the male in general coloration, 
but her forehead and crown are chestnut-brown. Bill 
dark brown; tarsi and toes lead-colour; irides brown. 
Length 5# inches. The young of both sexes resemble 
the female in colour. 
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