Above, a bird, a Cretan sheep and two African sheep, an insect and a mollusc; below, three butterflies, a bird of paradise and a titmouse. Engraving by Heath.

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Above, a bird, a Cretan sheep and two African sheep, an insect and a mollusc; below, three butterflies, a bird of paradise and a titmouse. Engraving by Heath. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.