Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming across calm pond behind beaver dam on mountain river, fall foliage reflectd in water, evening, Denali National Park, Alaska

Igor Shpilenok / Desman {Desmana moschata} standing on hind legs, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} hunting underwater, Bryansky Les Zapovednik, Russia.

Patricio Robles Gil / Semi-aquatic communities of Water Lilies in a wetland near the Tamesi River, south Tamaulipas, Mexico

Yashpal Rathore / Fungoid Frog (hylarana malabarica), large size semi-aquatic frog. Amboli, Maharashtra, India.

Pete Oxford / Swamp rabbit (Sylvilagus aquaticus) Little St Simon's Island, Barrier Islands, Georgia, USA

Pete Oxford / Black bellied salamander (Desmognathus quadramaculatus) North Georgia, USA, captive

LYNN M. STONE / Pickerel-weed (Pontederia cordata) semi-aquatic wildflower, Connecticut, USA

John Cancalosi / Black necked Garter Snake (Thamnophis cyrtopsis) semi-aquatic, moving over lilypads, Arizona, USA

John Cancalosi / Black necked Garter Snake (Thamnophis cyrtopsis) semi-aquatic, moving over lilypads, Arizona, USA

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming branches across calm pond behind beaver dam, fall evening, Denali National Park, Alaska

Willem Kolvoort / Semi-aquatic weevil (Pachyrhinus / Bagous elegans) on Swan mussel (Anodon cygnaea), Lake Naarden, Holland