Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) group photographed by tourist, Fernandina Island, Galapagos Islands, Ecuador

Rob Jordan / 2020VISION / Timelapse of tourists boarding a boat to take them to the Farne Islands, Seahouses Harbour, Northumberland, England, UK, July 2011

Thomas Marent / African Elephant (Loxodonta africana) crossing dirt road near tourists, Serengeti National Park, Tanzania

Wild Wonders of Europe / Lundgren / European sturgeon (Huso huso) captive at Danube Delta Eco-Tourism Museum Centre aquarium in Tulcea, Danube Delta, Romania, June. Critically endangered.

Enrique Lopez-Tapia / Domestic Asian elephants (Elephas maximas) used for riding safaris with their keepers, Royal Chitwan National Park, Nepal.

Enrique Lopez-Tapia / Domestic Asian elephants (Elephas maximas) used for riding safaris with their keepers, Royal Chitwan National Park, Nepal.

Enrique Lopez-Tapia / Tourists riding on domestic Indian elephant (Elephas maximus) crossing Narayani River in the dawn mist during wildlife safari, Royal Chitwan National Park, Nepal.

Enrique Lopez-Tapia / Tourists riding domesticated Indian Elephant (Elephas maximas) on safari, Royal Chitwan National Park, Nepal. October 2011.

Enrique Lopez-Tapia,Enrique Lopez-Tapia / Gentoo penguin (Pygoscelis papua) and Antarctic cruise liner 'MV Ushuaia' in Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists on a zodiac going past icebergs in Iceberg Alley, Pleneau Island, Antarctica

Rob Jordan / 2020VISION / Arctic tern (Sterna paradisaea) in flight at twilight using slow shutter speed to accentuate blur and motion in low-key light, Inner Farne, Farne Islands, Northumberland, July.

Rob Jordan / 2020VISION / Arctic Tern on rocks with watching tourists on Inner Farne, Farne Islands, Northumberland