Sven Zacek / Aerial view of a small forest lake in Karula National Park, Valgamaa county, Southern Estonia. Highly commended in the Wildlife Photographer of the Year Awards 2019.

Sven Zacek / Ural owl (Strix uralensis) hunting, Tartumaa county, Southern Estonia.

Sven Zacek / Ural owl (Strix uralensis) in flight, hunting, Tartumaa county, Southern Estonia. February.

Neil Aldridge / Two Lady's slipper orchids (Cypripedium calceolus) in flower in spring in woodland near Kuressaare, Saaremaa, Estonia.

Sven Zacek / Otter (Lutra lutra) resting in snow, Southern Estonia. January.

Sven Zacek / Ural owl (Strix uralensis) perching on an Apsen tree during the blue hour of dawn, Tartumaa, Estonia, April.

Sven Zacek / Black grouse (Tetrao tetrix) males lekking at sunrise, Southern Estonia, April.

Sven Zacek / Wide angle view of Otter (Lutra lutra) walking on the ice of a river, Southern Estonia, January.

Sven Zacek / Sunrise over a frozen bog pool, Tartumaa, Estonia, November 2014.

Sven Zacek / Aerial view of Rver Koiva, and the border between Estonia and Latvia in Southern Estonia, Valgamaa, Estonia. August 2014. Estonia is on the left side of the river and Latvia on the right bank.

Sven Zacek / Cornflower (Centaurea cyanus) at sunset, with bokeh affect, Jogevamaa, Estonia, June.

Sven Zacek / Low angle shot of Ural owl (Strix uralensis) female returning to its nest at night. Southern Estonia, May.

Sven Zacek / Otter (lutra lutra) eating Gudgeon (Gobio gobio) in Southern Estonia, January.

Sven Zacek / Ural owl (Strix uralensis) chick trying to climb an aspen tree with its beak, talons and wings, Southern Estonia. June.

Sven Zacek / Ural owl (Strix uralensis) chick trying to climb an aspen tree with its beak, talons and wings, Southern Estonia. June.

Sven Zacek / Ural owl (Strix uralensis) female feeding her young with part of a pellet it has regurgitated. Estonia, May.

Sven Zacek / Female Ural owl (Strix uralensis) flying over a clear-cut area, Southern Estonia, May.

Sven Zacek / Wood sorrel (Oxalis acetosella) flowers, Southern Estonia.

Sven Zacek / Otter (Lutra lutra) running through snow, Southern Estonia, January.

Sven Zacek / Hepatica (Hepatica nobilis) white morph and normal blue morph, Southern Estonia, April.

Sven Zacek / Male Ural owl (Strix uralensis) flying to nest to feed female, Southern Estonia, March.

Sven Zacek / Otter (Lutra lutra) walking in fresh ice, Southern Estonia, January.

Staffan Widstrand / Eurasian wryneck (Jynx torquilla) Musteika Village, Lithuania, May.

Staffan Widstrand / Aquatic warbler (Acrocephalus paludicola) Nemunas River Delta, Lithuania. May. Vulnerable species species.

Staffan Widstrand / Moss covered fallen trees in old mixed conifer and broadleaf forest, Punia Forest Reserve, Lithuania, May.

Staffan Widstrand / Wild boar (Sus scrofa) in old mixed conifer and broadleaf forest, Punia Forest Reserve, Lithuania, May.

Staffan Widstrand / Wooden house in Musteika Village, Lithuania, May 2015.

Sven Zacek / Arctic tern (Sterna paradisea) sitting on its nest surrounded by various coastal colors. Harjumaa, Estonia. June.

Sven Zacek / Otter (Lutra lutra) portrait, in golden sunset light, Southern Estonia, December.

Sven Zacek / American mink (Mustela vison) on ice with Common frog (Rana temporaria) prey, Tartumaa, Estonia, January. Introduced species.

Sven Zacek / American mink (Mustela vison) shaking off fur on ice with Common frog (Rana temporaria) prey, Tartumaa, Estonia, January. Introduced species.

Sven Zacek / American mink (Mustela vison) running on ice with Common frog (Rana temporaria) prey, Tartumaa, Estonia, January. Introduced species.

Sven Zacek / Broken ice covered in snow at sunset, on the shore of Lake Vortsjarv, gathered to shore by extreme winds, Estonia. December 2014.

Sven Zacek / Frozen Birch trees (Betula sp) in a grove, Tartumaa, Estonia, January 2013.

Sven Zacek / Misty lake, with trees reflected in the water, and Willow (Salix) trees silhouetted on the shore, Suur Emajogi river, Tartumaa, Estonia, May 2014.

Sven Zacek / Pink algae in fresh snow on the coast of the Baltic Sea, Lahemaa National Park, Northern Estonia. December 2012.

Sven Zacek / Roe Deer (Capreolus capreolus) herd in snowy field in Tartumaa, Estonia, March.

Sven Zacek / Roe deer (capreolus capreolus) buck with velvet antlers and fawn, Tartumaa, Estonia, March.

Sven Zacek / Ravens (Corvus corax) fighting in bog during snowfall, Tartumaa, Estonia. December.

Sven Zacek / Aerial view at sunrise of fog over bog forest, Tartumaa, Estonia, May 2013.

Sven Zacek / Roe deer (Capreolus capreolus) buck with velvet antlers and fawn at sunset, Tartumaa, March 2013.

Sven Zacek / Roe deer (Capreolus capreolus) buck with velvet antlers in snowy field at sunset, Tartumaa, Estonia, March.

Sven Zacek / Four Roe deer (Capreolus capreolus) bucks with velvet antlers and the shadow of a fifth buck, Tartumaa, Estonia, March.

Sven Zacek / Roe deer (capreolus capreolus) buck portrait, with velvet antlers. Tartumaa, Estonia, March.

Sven Zacek / Melting ice in bog in spring, Tartumaa, Estonia, April 2013.

Sven Zacek / Roe deer (Capreolus capreolus) buck in snowy field, Vesneri, southern Estonia, March. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) buck, Vesneri, Estonia, March. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) buck with does, Vesneri, Estonia, March. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) herd moving through snow, Estonia, March. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) in the snow, two running away towards a third facing the camera, Vorumaa, Estonia, January. Winner of the Animal stories portfolio in the Melvita Nature Images Awards co...

Sven Zacek / Two Roe deer (Capreolus capreolus) sniffing each other in the snow, Vorumaa, Estonia, January. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) in dense fog. Vorumaa, Estonia, January. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) group in snow, looking at camera. Vorumaa, Estonia, December. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) running through snow, Vorumaa, Estonia, January. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) buck and doe interacting, Vesneri, Estonia, March. Winner of the Animal stories portfolio in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Ural owl (Strix uralensis) flying to nest with star trails in sky above, Estonia, May. Winner of the Birds category in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Roe deer (Capreolus capreolus) in fog at sunset, Estonia, September. Nominated in the Melvita Nature Images Awards competition 2014.

Sven Zacek / Aerial view of three Roe deer (Capreolus capreolus) walking in line along trail in snow, with long shadows before sunset, Estonia, May. Winner of the Mammals category and the Animal stories portfolio...

Markus Varesvuo / Wood Warbler (Phylloscopus sibilatrix), Estonia, May 2005

Sven Zacek / Moose (Alces alces) herd on a cold -18 C morning amongst frozen willow bushes, with snow, in Tartumaa, Estonia. January. Highly commended in the Mammals category of the GDT competition 2013.

Sven Zacek / Rays of sunshine behind pine trees, Southern Estonia, May early morning.

Sven Zacek / Female Long-eared owl (Asio otus) peeking from behind a spruce tree, Southern Estonia, June.

Sven Zacek,Sven Zacek / Roe deer buck (Capreolus capreolus) in field sniffing air, Southern Estonia, May

Sven Zacek,Sven Zacek / Calm morning before sunrise over a bog lake. Southern Estonia, July 2006.

Sven Zacek,Sven Zacek / European Hare (Lepus europaeus) beyond a hay bale in foggy meadow. Northern Latvia, July.

Sven Zacek,Sven Zacek / Great Tit (Parus major) in flight. Southern Estonia, December.

Sven Zacek,Sven Zacek / European Greenfinch (Carduelis chloris) in flight. Southern Estonia, December.

Sven Zacek,Sven Zacek / Two bull Moose (Alces alces) sizing each other up during the annual rut, after sunset with migrating geese in flight. Western Estonia, September.

Sven Zacek,Sven Zacek / Famous Puhajarve war oak (Quercus) seen through dense fog. Southern Estonia, April 2011.

Sven Zacek / Frozen leaf in lake ice. Southern Estonia, April.

Sven Zacek,Sven Zacek / Mute Swans (Cygnus olor) resting on ice after sunset. Baltic Sea, northern Estonia, March.

Sven Zacek / Sunrise over mineral islands in the Muraka bog in Eastern Estonia. August 2011.

Sven Zacek / Woman and child looking at a thrush (Turdidae) nest. Southern Estonia, August. Model released

Sven Zacek,Sven Zacek / European Greenfinch (Carduelis chloris) in flight. Southern Estonia, December.

Sven Zacek / Vahandu River in spate after snow melt. Southern Estonia, February 2013.

Sven Zacek,Sven Zacek / Fresh snow and ice on Baltic Sea coast. The red colour comes from seaweed beneath the ice. Baltic sea coast, Northern Estonia, December 2012.

Sven Zacek,Sven Zacek / Dawn over frozen Lake Peipsi, with sheet ice formations caused by strong wind. Eastern Estonia, December 2012.

Sven Zacek,Sven Zacek / Baltic sea is freezing up along the northern coast of Estonia. Lahemaa National Park, Estonia, January 2012.

Sven Zacek,Sven Zacek / Waves along the Baltic Sea coast of Northern Estonia. January 2012.

Sven Zacek / Trees that have been gnawed by Beavers (Castor fiber) Southern Estonia, October.

Sven Zacek / Ice covered rocks along coast of the Baltic Sea, Northern Estonia.

Sven Zacek,Sven Zacek / Ice sheets before sunrise in Estonia. December 2009.

Sven Zacek,Sven Zacek / Small pine tree growing in bog, just before sunrise. Estonia August 2011.

Sven Zacek / Foggy morning in wetland forest in Estonia. August 2011.

Sven Zacek / Sunrise on a wetland forest island in Estonia. August 2011.

Sven Zacek,Sven Zacek / Moonrise over misty bog in Estonia. June 2009.

Sven Zacek,Sven Zacek / Kopu lighthouse - the oldest lighthouse in Estonia, on Hiiumaa island. August 2011.

Sven Zacek,Sven Zacek / House Martin (Delichon urbicum) in flight. Jogevamaa county, Estonia, July.

Sven Zacek,Sven Zacek / Blue light after sunset at the Peipsi Lake, the largest lake in Estonia. August 2007.

Sven Zacek / Roe deer (Capreolus capreolus) in foreground with second deer on horizon in snow, Estonia, December. Highly commened in CREATIVE VISIONS OF NATURE category, 2011 WILDLIFE PHOTOGRAPHER OF THE YEAR COM...

Niall Benvie / MYN / Smooth newt (Triturus vulgaris) male, showing underside, Alam-Pedja nature reserve, Tartumaa, Estonia, May, meetyourneighbours.net project

Staffan Widstrand / Great white heron / egret (Ardea / Egretta alba) taking off, Nemunas Delta Nature Reserve, Lithuania.

Staffan Widstrand / Black tern (Chlidonias nigra) flying in to feed its chick on tfloating vegetation in the Nemunas Delta Nature Reserve, Lithuania.

Sven Zacek / Ural owl (Strix uralensis) female watching fledgling learning to climb and balance on branch. Owlet's first day out of nest. Tartumaa County, Southern Estonia. June.

Sven Zacek / Frozen bends and flood plain of Halliste River, aerial view. Soomaa National Park, Viljandimaa County, Estonia. Febraury 2019.

Sven Zacek / Ural owl (Strix uralensis) flying in front of agricultural equipment in Vorumaa county, Southern Estonia. February.