Willem Kolvoort / Water filled ditch with shadow of a tree on water with Fringed waterlily (Nymphoides peltata) Star duckweed (Lemna trisulca) Netherlands. July 2015. Commended in the Underwater World Category of the G...

Willem Kolvoort / Green Turtle (Chelonia mydas) hatchling swims towards the deep part of the sea to escape from possible predators, Anse de Mais, West Grande Terre, Aldabra, Indian Ocean

Willem Kolvoort / Green Turtle (Chelonia mydas) hatchling swims towards the deep part of the sea to escape from possible predators, Anse de Mais, West Grande Terre, Aldabra, Indian Ocean

Willem Kolvoort / Green Turtle (Chelonia mydas) hatchling swims towards the deep part of the sea to escape from possible predators, Anse de Mais, West Grande Terre, Aldabra, Indian Ocean

Willem Kolvoort / Split level view of young mangrove shoots, Passe Grande Magnan / Magnan channel, Aldabra, Indian Ocean

Willem Kolvoort / Aldabra giant tortoise (Aldabrachelys gigantea) swimming in Passe Grande Magnan / Magnan channel, Aldabra, Indian Ocean Image taken under controlled conditions.

Willem Kolvoort / Split level view of Aldabra giant tortoise (Aldabrachelys gigantea) swimming in Passe Grande Magnan / Magnan channel, Aldabra, Indian Ocean Image taken under controlled conditions.

Willem Kolvoort / White waterlily (Nymphaea alba) in Naardermeer bog lake, Holland. May.

Willem Kolvoort / View of Byoutier. a very small island in the Seychelles with a pristine beach. Byoutier, Seychelles March 2005

Willem Kolvoort / Water lily (Nymphaea rudgeana) leaves viewed from below in a black water creek. Suriname, October.

Willem Kolvoort / Tetra (Moenkhausia surinamensis) under Apinagia leaves. Awadan rapids, Gran Rio, Suriname, September.

Willem Kolvoort / Aquatic plants and algae in river, River Black Drim, Albania, Eastern Europe, May 2009

Willem Kolvoort / Aquatic plants on river bed, River Black Drim, Albania, Eastern Europe, May 2009

Willem Kolvoort / Aquatic plants in River Black Drim, Albania, Eastern Europe, May

Willem Kolvoort / Underwater freshwater springs in the River Black Drim, Albania, Eastern Europe, May 2009

Willem Kolvoort / Silhouette of immature European edible frog (Rana esculenta) on top of waterlily leaf, tail stump still visible, garden pond, Holland

Willem Kolvoort / Split level view of White water lily (Nymphaea alba) flowering at surface with windmill behind, Lake Naarden, Holland

Willem Kolvoort / Tadpoles of Common frog (Rana temporaria) amongst reed stems in sand winning pit, Holland

Willem Kolvoort / Common frogs (Rana temporaria) mating out of water, Holland

Willem Kolvoort / Common frogs (Rana temporaria) mating amongst a mass of frogspawn, Holland

Willem Kolvoort / Common toad (Bufo bufo) tadpoles amongst algae and reedstems in small lake. Netherlands.

Willem Kolvoort / Edible frog (Pelophylax esculentus) frogspawn amongst Common water-crowfoot (Ranunculus aquatilis) in garden pond. Netherlands. May.

Willem Kolvoort / Mating edible frogs (Pelophylax esculentus) in garden pond. Netherlands. May.

Willem Kolvoort / Common toad (Bufo bufo) tadpoles amongst stonewort in ditch. Netherlands. May.

Willem Kolvoort / Common frog (Rana temporaria) male attempting to mate with Barbel fish (Barbus barbus). Netherlands. Captive.

Willem Kolvoort / Great crested newt (Triturus cristatus) eggs between folded plant leaves. In a garden pond, Netherlands. April.

Willem Kolvoort / Common newt (Lissotriton vulgaris), pair amongst White waterlily (Nymphaea alba) leaves. Garden pond, Netherlands. April.

Willem Kolvoort / Common toad (Bufo bufo) tadpoles amongst Perfoliate pondweed (Potamogeton perfoliatus) in ditch. Netherlands. May.

Willem Kolvoort / Common toad (Bufo bufo) tadpoles amongst ditch vegetation. Netherlands. May.

Willem Kolvoort / Common newt (Lissotriton vulgaris) female amongst Shining pondweed (Potamogeton lucens) in garden pond. Netherlands. April.

Willem Kolvoort / Great crested newt (Triturus cristatus) male in garden pond. Netherlands. April.

Willem Kolvoort / Great crested newt (Triturus cristatus) female egg laying amongst water plants. In garden pond, Netherlands. April.

Willem Kolvoort / Common newt (Lissotriton vulgaris) male amongst water plants in garden pond. Netherlands. April.

Willem Kolvoort / Common newt (Lissotriton vulgaris) pair approaching each other on Spiked water-milfoil (Myriophyllum spicatum) prior to mating. In garden pond, Netherlands. April.

Willem Kolvoort / Great crested newt (Triturus cristatus) pair approaching each other prior to mating. In garden pond, Netherlands. April.

Willem Kolvoort / Common toad (Bufo bufo) resting on bottom of lake. Netherlands. April.

Willem Kolvoort / Common newt (Lissotriton vulgaris) pair prior to mating amongst water plants in garden pond. Netherlands. April.

Willem Kolvoort / Common toad (Bufo bufo), male attempting to mate with dead Common frog (Rana temporaria) in lake. Netherlands. Small repro only.

Willem Kolvoort / Common toad (Bufo bufo) tadpoles eating algae on Floating pondweed (Potamogeton natans). Netherlands. May.

Willem Kolvoort / Common toad (Bufo bufo) tadpoles amongst algae. Netherlands.

Willem Kolvoort / Sinkhole on the Kugitang plain, Turkmenistan, 1990. Small repro only.

Willem Kolvoort / Sinkhole on the Kugitang plain, Turkmenistan, 1990. Small repro only.

Willem Kolvoort / Sinkhole on the Kugitang plain, Turkmenistan, 1990. Small repro only.

Willem Kolvoort / People diving in a sinkhole, Turkmenistan, 1990. Small repro only.

Willem Kolvoort / Diving in a sinkhole. Turkmenistan, 1990. Small repro only.

Willem Kolvoort / People diving in blind loach cave. Turkmenistan. Small repro only.

Willem Kolvoort / Sinkhole on the Kugitang Plain, Turkmenistan, 1990. Small repro only.

Willem Kolvoort / Salt crystals on the ground of the Kugitang Plain, Turkmenistan, 1990. Small repro only.