Heads of seven birds, seen in profile: garden warbler, crossbill, lesser grey shrike, bullfinch, rock sparrow, dove and hooded crow. Chromolithograph by H.J. Ruprecht, 1877.

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Heads of seven birds, seen in profile: garden warbler, crossbill, lesser grey shrike, bullfinch, rock sparrow, dove and hooded crow. Chromolithograph by H.J. Ruprecht, 1877. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.