Above, an insect, a monkey, a plant (bromelia), a shell and three birds; below, a beetle, a cactus and two plants. Engraving by Heath.

Licence: Public Domain Mark

Credit: Above, an insect, a monkey, a plant (bromelia), a shell and three birds; below, a beetle, a cactus and two plants. Engraving by Heath. Wellcome Collection. Source: Wellcome Collection.