Juergen Freund / Timelapse of a Cairns birdwing (Ornithoptera euphorion) butterfly caterpillar metamorphosing into a chrysalis, Queensland, Australia, April.

Juergen Freund / Timelapse of a Cairns birdwing (Ornithoptera euphorion) butterfly caterpillar emerging from egg on an Dutchman's pipe (Aristolochia) leaf and feeding, Queensland, Australia, April.

Chris Mattison / Close up of succulent plant (Peperomia columella) cultivated plant form Peru. Focus-stacked image.

Heather Angel / Brazilian Dutchman's pipe flower (Aristolochia gigantea) with green inflated pouch. Flower smells of carrion to attract fly pollinators. Cultivated in glasshouse, Surrey, England, UK. Native to Br...

Heather Angel / Brazilian Dutchman's pipe flower (Aristolochia gigantea) with green inflated pouch. Flower smells of carrion to attract fly pollinators. Cultivated in glasshouse, Surrey, England, UK. Native to Br...

Eladio Fernandez / Dutchman's pipe (Aristolochia passiflorifolia) Camaguey, Cuba, July.

Paul Harcourt Davies / Birthwort (Aristolochia clematitis) Umbria, Italy, June.

Chris Mattison / Long-tailed wild ginger (Asarum caudatum) flower, Oregon, USA

Philippe Clement / Close up of European birthwort (Aristolochia clematitis) in flower, native to Europe, June

Pete Oxford / Woman selling Betel leaf (Piper betle) a mild stimulant, Barabazar market, Shillong, Meghalaya, North East India. October 2014

Adrian Davies / Birthwort (Aristolochia rotunda), Provence, France, May.

Adrian Davies / Birthwort (Aristolochia rotunda), Provence, France, May.