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.

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.

Paul Harcourt Davies / Yellow bird's nest (Monotropa hypopitys) growing in pine needles. This plant is parasitic upon fungi. Forca D'Ancarano, Norcia, Umbria, Italy, June.

Paul Harcourt Davies / Yellow bird's nest / Dutchman's pipe (Monotropa hypopitys) flowers growing in pine needles. Parasitic plant on fungi. Forca D'Ancarano, Norcia, Umbria, Italy, June.

Paul Harcourt Davies / Yellow bird's nest / Dutchman's pipe (Monotropa hypopitys) flower growing in pine needles. This species is parasitic on fungi. Forca D'Ancarano, Norcia, Umbria, Italy. June.

Dong Lei / Dutchman's pipe (Monotropa hypopitys) flowers, Jiuzhaigou National Nature Reserve, Sichuan Province, China, August.

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

Dong Lei / Dutchman's pipe (Monotropa hypopitys) Lijiang Laojunshan National Park, Yunnan, China, July.