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

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

Willem Kolvoort / Semi aquatic beetles {Macroplea appendiculata} and Rotifer colonies on Shining Pondweed, Sand-winning pit, Holland

Willem Kolvoort / Semi-aquatic beetles (Macroplea appendiculata) on Shining pondweed (Potamogeton lucens) with Rotifer colonies (Sinantherina), sand-winning pit, Holland

RICHARD KIRBY / Semi submerged Spectacled caiman (Caiman crocodilus) Venezuela Llanos, South America

Willem Kolvoort / Swan Mussel (Anodonta cygnaea) with semi-aquatic Weevil. Lake Naarden, Holland. Mussel is filtering water to feed on plankton.

Igor Shpilenok / Two Desmans {Desmana moschata} swimming next to reeds, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} at den entrance, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} swimming next to reeds, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} resting on fallen branch, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} swimming next to reeds, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Two Desmans {Desmana moschata} meet in water, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} swimming amongst pondweed, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Two Desmans {Desmana moschata} fighting in water, Bryansky Les Zapovednik, Russia.

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

Igor Shpilenok / Desman {Desmana moschata} on river bank, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Two Desmans {Desmana moschata} on river bank, Bryansky Les Zapovednik, Russia.

Igor Shpilenok / Desman {Desmana moschata} on a branch, Bryansky Les Zapovednik, Russia.

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

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

Tony Heald / Helmeted turtle / Marsh terrapin {Pelomedusa subrufa} portrait, Namibia.

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

Yva Momatiuk & John Eastcott / American Beaver (Castor canadensis) a semi-aquatic rodent swimming across tundra pond behind beaver dam, with colorful reflections of fall tundra and vegetation on water ripples created by its passage...