Alex Mustard / Whale shark (Rhincodon typus) close to the camera with a golden trevally fish (Gnathanodon speciosus) and outline of another whale shark behind , in the plankton-rich green waters of La Paz bay, Baja...

David Woodfall / Two Little terns (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

David Woodfall / Little tern (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

TJ Rich / Four chocolate working cocker spaniels on wall. Mother and offspring. Monmouth, Monmouthshire, Wales

TJ Rich / Black working cocker spaniel in bluebells, in beech woodland, Micheldever Woods, Hampshire, UK

TJ Rich / Wirehaired daschund, Staffordshire bull terrier and Hungarian viszla in autumn colours, Wiltshire, UK

David Fleetham / Pixy hawkfish (Cirrhitichthys oxycephalus) in area of rich coral growth. Bali, Indonesia.

Sergey Gorshkov / Snow goose (Chen caerulescens caerulescens) brooding chicks, with rusty orange face from iron rich soil in which it forages. Wrangel Island, Far Eastern Russia, June.

Juergen Freund / Andamooka opals held in hand, South Australia, June 2011

Erlend Haarberg,Erlend Haarberg / Aerial view down river to the east of the Hofsjakull glacier and west of the Sprengisandur upland desert. Innumerable rivulets flow from beneath the glacier in this area of tundra which abounds in pon...

Ben Lascelles / Mineral rich landscape and copper lake from the Bogo La pass at17000 ft, Tibet, June 2010

Mark Carwardine / Amazon / pink river dolphin / boto (Inia geoffrensis) Rio Negro, Brazil (Amazon) wild animal underwater in tannin rich river, Threatened species (IUCN Red List)