Jeff Rotman / Man and woman with Cannabis plant in organic Marijuana farm, Pueblo, Colorado, USA, June 2015. . Marijuana has legalized in the state of Colorado, and this farm produces Marijuana for medical and reta...

Jeff Rotman / Person holding large Cannabis bud, in organic Marijuana farm, Pueblo, Colorado, USA, June 2015. . Marijuana has legalized in the state of Colorado, and this farm produces Marijuana for medical and ret...

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) casualty of paralytic tick (Ixodes holocyclus) bite being cared for on site of colony by Jenny Mclean, North Queensland, Australia, November 2012

Shibai Xiao / Preserved root of Chinese goldthread (Coptis chinensis) used in traditional Chinese medicine, Henan Province, China, March 2010. No release available.

Jeff Rotman / Irula Snake Tribe member holding vials of snake anti-venom for Viper, Krait and Cobra bites. Southern India.

Petra Wegner / British Shorthair Cat, kitten, golden-ticked-tabby, being administered ophthalmic ointment by a woman. Model released

Niall Benvie / Photograph of Hairy St John's wort (Hypericum hirsutum) manipulated and text added to represent illustrated book page. Scotland, UK, July

Pete Oxford / Tiger leg bones and feet with claws together for sale as medicine by Tibetans in a market near Fugong, Yunnan Province, China 2006

Jose B. Ruiz / Medicinal plants for sale at market, Granada, Spain

Konrad Wothe / Ginkgo (Ginkgo biloba) close up of leaves, medicinal plant, Germany

Konrad Wothe / Purple Coneflower (Echinacea purpurea)

Jim Brandenburg / Coneflower (Echinacea sp) field, Wisconsin