Sven Zacek / Brimstone butterfly(Gonepteryx rhamni) male and female during mating flight, early spring. Tartumaa county, Southern Estonia. May.
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Sven Zacek / Ural Owl (strix uralensis) female with talons ready to attack a ringing ornithologist, Tartumaa county, Southern Estonia. May.
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Sven Zacek / Black Grouse (Tetrao tetrix) two males facing off on a lekking site, Varumaa county, Southern Estonia. April.
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Sven Zacek / Aerial view of a golden and foggy sunrise over a bog area, Alam-Pedja National Park, Tatrumaa county, Southern Estonia. May.
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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.
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Sven Zacek / Ural owl (Strix uralensis) hunting, Tartumaa county, Southern Estonia.
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Sven Zacek / Ural owl (Strix uralensis) in flight, hunting, Tartumaa county, Southern Estonia. February.
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Sven Zacek / Ural owl (Strix uralensis) nestling, Tartumaa county, Southern Estonia. May.
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Markus Varesvuo / White-fronted goose (Anser albifrons) and Taiga bean goose (Anser fabalis rossicus) flocks in flight and on water. Latvia. April.
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Markus Varesvuo / Citrine wagtail (Motacilla citreola) male perched on Reed. Latvia. April.
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Sven Zacek / Eurasian pygmy owl (Glaucidium passerinum) perched on snow covered branch in evening light. Vorumaa, Southern Estonia. November.
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Sven Zacek / Wild boar (Sus scrofa) swimming with head above water in Suur Emajogi River. Alam-Pedja Nature Reserve, Tartumaa, Southern Estonia. November.
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Sven Zacek / Brown bear (Ursus arctos) in coniferous forest. Ida-Virumaa, Eastern Estonia. September.
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Sven Zacek / Sun dog over trees in frosty landscape. Tartumaa, Southern Estonia. December 2015.
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Sven Zacek / Bog surrounding river in morning light. Emajoe Suursoo Nature Reserve, Tartumaa, Estonia. October 2015.
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Sven Zacek / Sunrise over bog with trees reflected in pool. Endla Nature Reserve, Jogevamaa, Central Estonia. October 2015.
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Sven Zacek / White-tailed sea eagle (Haliaeetus albicilla) flying over frost and snow covered forest. Tartumaa, Southern Estonia. January 2011.
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Sven Zacek / Ural owl (Strix uralensis) female on nest, male landing with twig in beak. Tartumaa, Southern Estonia. April.
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Sven Zacek / Ural owl (Strix uralensis) male presenting prey to nesting mate. Tartumaa, Southern Estonia. April.
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Sven Zacek / Ural owl (Strix uralensis) female feeding at nest on rodent prey presented by mate. Tartumaa, Southern Estonia. April.
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Sven Zacek / Ural owl (Strix uralensis) female on the nest with nestling hidden under wing. Tartumaa, Southern Estonia. April.
Sven Zacek / Ural owl (Strix uralensis) female and nestling on nest in tree stump. Tartumaa, Southern Estonia. May.
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Sven Zacek / Mist over bog with conifers in pre-dawn light. Endla Nature Reserve, Jogevamaa, Central Estonia. June 2016.
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Sven Zacek / Roe deer (Capreolus capreolus) young buck, portrait. Karula National Park, Valgamaa, Southern Estonia. June.
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Sven Zacek / Beaver (Castor fiber) felling a Birch (Betula sp) tree for winter supplies. Tartumaa, Southern Estonia. November.
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Sven Zacek / Frozen bog pool system, aerial view. Endla Nature Reserve, Jogevamaa, Central Estonia. December 2016.
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Sven Zacek / Ural owl (Strix uralensis) female on nest after snowfall. Tartumaa, Southern Estonia. March.
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Sven Zacek / Ural owl (Strix uralensis) female on nest in tree stump. Tartumaa, Southern Estonia. April.
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Sven Zacek / Black woodpecker (Dryocopus martius) excavating nest hole. Valgamaa, Southern Estonia. April.
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Sven Zacek / Ural owl (Strix uralensis) female in flight having taken off from nest, in evening light. Tartumaa, Southern Estonia. May.
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Sven Zacek / Ural owl (Strix uralensis) female flying with prey in beak. Flying back to nest in evening light. Tartumaa, Southern Estonia. May.
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Sven Zacek / Meandering Loobu River with surrounding meadows and woodlands, aerial view. Lahemaa National Park in Northern Estonia in Laane-Virumaa, Estonia. May 2017.
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Sven Zacek / Dandelion (Taraxacum officinale), a field of many seedheads highlighted at sunset. Karula National Park, Valgamaa, Southern Estonia. June 2017.
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Sven Zacek / Flooded meanders of Halliste River, aerial view. Soomaa National Park, Parnumaa, Western Estonia. October 2017.
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Sven Zacek / Eurasian beaver (Castor fiber) with Willow (Salix sp) branch for winter stockpile. Near Suur Emajogi River, Tartumaa, Southern Estonia. January.
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Sven Zacek / Eurasian beaver (Castor fiber) on ice besides reeds in Emajogi River, Tartumaa, Southern Estonia. January.
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Sven Zacek / Great bittern (Botaurus stellaris) with fish in beak, caught in stream. Laanemaa, Western Estonia. March.
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Sven Zacek / Honey bee (Apis mellifera), two frozen on pond ice after flying out too early. Valgamaa, Southern Estonia. March.
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Sven Zacek / Ural owl (Strix uralensis) perched on Alder (Alnus sp) tree at dusk. Tartumaa, Southern Estonia. April.
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Sven Zacek / Black woodpecker (Dryocopus martius) feeding chicks at nest in tree trunk viewed from above, Valga County, Estonia. May. Highly commended in the GDT European Wildlife Photographer of the Year Awards...
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Neil Aldridge / Two Lady's slipper orchids (Cypripedium calceolus) in flower in spring in woodland near Kuressaare, Saaremaa, Estonia.
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Sven Zacek / Great grey owl (Strix nebulosa) perched on dead umbellifer plant, winter, Finland, February.
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Sven Zacek / Otter (Lutra lutra) resting in snow, Southern Estonia. January.
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Sven Zacek / Ural owl (Strix uralensis) perching on an Apsen tree during the blue hour of dawn, Tartumaa, Estonia, April.
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Sven Zacek / Black grouse (Tetrao tetrix) males lekking at sunrise, Southern Estonia, April.
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Sven Zacek / Wide angle view of Otter (Lutra lutra) walking on the ice of a river, Southern Estonia, January.
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Sven Zacek / Sunrise over a frozen bog pool, Tartumaa, Estonia, November 2014.