Steve O. Taylor (GHF) / Guide taking in view of escarpment, Mali, 2005-2006.

Christophe Courteau / Tourists and guide using snowshoes on an ecotourism trekking holiday, Svalbard, Norway, June, 2012. Model released.

Oriol Alamany / Portrait of a South African Parks Ranger whilst supervising a walking safari, Kruger National Park, Transvaal, South Africa, September 2008. No release available.

Kristel Richard / Wild meerkats (Suricata suricatta) habituated to humans standing alert on local guide, Makgadikgadi Pans, Kalahari desert, Botswana.

Kristel Richard / Wild meerkats (Suricata suricatta) habituated to humans acting as sentry and standing alert on local guide's head for height, Makgadikgadi Pans, Kalahari desert, Botswana. No release available.

Eric Baccega / Portrait of young female Inuit guide, Nunavut, Canada, August 2010. Model released

Staffan Widstrand / Toursit guide looking up into rainforest canopy with binoculars, Bwindi forest,

Tui De Roy / Glacier with tourist expedition in inflatable zodiac, southern Greenland Fjords, Greenland

Ann & Steve Toon / Guide lifting trap door of spider burrow to show baby spiderlings inside, iMfolozi game reserve, KwaZulu-Natal, South Africa.

Claudio Contreras / Guide in front of prehistoric rock paintings of Bighron sheep and people. La Pintada cave, San Francisco Sierra, El Vizcaino Biosphere Reserve, Baja California Peninsula, Mexico.

Claudio Contreras / Guide sitting beneath prehistoric rock painting. El Palmarito cave, Santa Martha Sierra, El Vizcaino Biosphere Reserve, Baja California Peninsula, Mexico. 2008.

Claudio Contreras / Guide looking at prehistoric rock painting. El Palmarito cave, Santa Martha Sierra, El Vizcaino Biosphere Reserve, Baja California Peninsula, Mexico. 2008.