Ross Hoddinott / 2020VISION / River Exe, near Winsford, showing river correctly fenced to stop cattle from polluting the river, or eroding the river banks. Healthy example of river habitat. Exmoor National Park, Somerset, UK. May...

Ross Hoddinott / 2020VISION / School children carrying equipment to release salmon fry in the River Haddeo and to do invertebrate kick samples with Westcountry Rivers Trust (WRT) warden. Bury, Exmoor National Park, Somerset, UK. M...

Ross Hoddinott / 2020VISION / School child releases salmon fry in the River Haddeo, with Westcountry Rivers Trust (WRT) warden. Bury, Exmoor National Park, Somerset, UK. May 2012. Editorial use only

Ross Hoddinott / 2020VISION / Golitha Falls, River Fowey flowing through wooded valley with moss covered trees, Nr St Cleer, Cornwall, UK, May 2012

Mark Carwardine / Looking down on Sumatran rhino (Dicerorhinus sumatrensis) walking through stream. Captive-Sumatran Rhino Sanctuary, within Way Kambas National Park, Lampung Province, southern Sumatra, Indonesia

Oriol Alamany / Nigel Creek with conifer forest at dusk, Banff National Park, Rocky Mountains, Alberta, Canada

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) dominant male silverback 'Makumba' aged 32 years sitting by a river in forest interior, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central...

Anup Shah / Western lowland gorilla (Gorilla gorilla gorilla) juvenile female 'Bokata' aged 6 years approaching a river, Bai Hokou, Dzanga Sangha Special Dense Forest Reserve, Central African Republic. December 2...

Graham Eaton / A split level image of a small mountain stream. Cwm Idwal, Snowdonia, Wales, September 2011.

Yukihiro Fukuda / Japanese giant salamander (Andrias japonicus) eating the eggs of another salamander, Japan, August

Yukihiro Fukuda / Japanese giant salamander (Andrias japonicus) moving upstream to spawn, Japan, August

Yukihiro Fukuda / Male Japanese giant salamander (Andrias japonicus) in river, Japan, August