. British birds. Birds. 250 BRITISH BIRDS. BLUE EGGS OF TERNS AND GULLS. With reference to the notes on the blue eggs of Common Terns and Black-headed Gulls, may I be allowed to point out that in many of these varieties the surface of the egg is as glossy as in the more usual types and that the shell is up to the average in thickness ; also that the blue eggs are not the only con- spicuous varieties ?. NEST OF SANDWICH TERN. {Photographed hy Yl. B. Dunlop), The Rev. F. C. R. Jourdain overlooks the fact that it is from the Gulls themselves that the eggs have primarily to be protected; if the bi
. British birds. Birds. 250 BRITISH BIRDS. BLUE EGGS OF TERNS AND GULLS. With reference to the notes on the blue eggs of Common Terns and Black-headed Gulls, may I be allowed to point out that in many of these varieties the surface of the egg is as glossy as in the more usual types and that the shell is up to the average in thickness ; also that the blue eggs are not the only con- spicuous varieties ?. NEST OF SANDWICH TERN. {Photographed hy Yl. B. Dunlop), The Rev. F. C. R. Jourdain overlooks the fact that it is from the Gulls themselves that the eggs have primarily to be protected; if the birds did not sit on the eggs as soon as laid, every variety at all conspicuous would immediately be taken by the Gulls. That there is a certain amount of local variation in the colouring of the eggs in different colonies is highly probable. A somewhat similar case is that of the songs of some species of birds, which are known to have distinct characteristics in different Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Witherby & Co
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