Ingo Arndt / Bark beetle (Scolytinae) galleries in dead spruce tree (Picea abies), Bayerischer Wald / Bavarian Forest National Park, Germany., June.

Konstantin Mikhailov / European wild cat (Felis silvestris) kitten sitting, Bavarian Forest National Park, Germany, May

Jouan & Rius / Eurasian lynx (Lynx lynx) walking through snow, captive, Bayerischer Wald / Bavarian Forest National Park, Germany

Jouan & Rius / Forest in winter, Bayerischer Wald National Park, Germany

Jouan & Rius / Forest in winter, Bayerischer Wald National Park, Germany

Jouan & Rius / Forest in winter, Bayerischer Wald National Park, Germany

Eric Baccega / Two European brown bears {Ursus arctos} play fighting in the snow. Bayerisher wald NP, Germany. Captive

Christoph Becker / Brown bear cub climbing tree (Urus arctos) Bayerischer Wald, Germany. captive

Juergen Freund / Grey wolves (Canis lupus) in snow, woodland Bayerischer Wald NP, Germany - captive

Eric Baccega / European grey wolves {Canis lupus} in snow, Bayerischer wald NP, Germany, captive

Konrad Wothe / Eurasian Lynx (Lynx lynx) pair touching noses in snow, Bayerischer Wald National Park, Germany

Konrad Wothe / Eurasian Lynx (Lynx lynx) pair resting in snow, Bayerischer Wald National Park, Germany

Konrad Wothe / Eurasian Lynx (Lynx lynx) pair sitting together in woods, back view, Bayerischer Wald National Park, Germany

Roger Powell / Garganey (Anas querqueda) male swimming. Ferienregion National Park, Bayerischer Wald, Bavaria, Germany. April.

Roger Powell / Northern Long-eared Owl (Asio otus) on a branch of a Scots Pine. Bayerische Wald, Bavaria, Germany. April.

Roger Powell / Stock Dove (Columba oenas) feeding on pasture grass. Bayerischer Wald, Bavaria, Germany. April.

Roger Powell / Black Grouse (Tetrao tetrix) male displaying from under a young Spruce Tree. Conifer Plantation, Bayerischer Wald National Park, Germany. April.

Konrad Wothe / Tropical rainforest at the western slopes of the Ecuadorian Andes, northern Ecuador.

Konrad Wothe / Tropical rainforest, Rio Papallacta, northern Ecuador.

Konrad Wothe / Red orchid in tropical rainforest, northern Ecuador.

Konrad Wothe / Tropical rainforest at the western slopes of the Ecuadorian Andes, northern Ecuador.

Konrad Wothe / Tropical rainforest, northern Ecuador.

Konrad Wothe / Bugs on Heliconia flower, Coreidae, Rainforest at Tambopata river, Tambopata National Reserve, Peru.

Konrad Wothe / Rainforest at Sandoval Lake, Tambopata National Reserve, Peru.

Konrad Wothe / Creek in forest, Bavarian Forest National Park, Lower Bavaria, Germany

NaturePL Showreels / Showreel of wintry clips by Philippe Clement from the Bavarian Forest National Park, Germany.

Juergen & Christine Sohns / Eurasian Eagle-Owl (Bubo bubo), Bavarian Forest National Park, Germany

Juergen & Christine Sohns / Brown Bear (Ursus arctos) cubs playing, Bavarian Forest National Park, Germany

Juergen & Christine Sohns / Brown Bear (Ursus arctos) cub yawning, Bavarian Forest National Park, Germany

Philippe Clement / Nature photographers and tourists waiting at the wolf enclosure to photograph wolves in the Tierfreigelande, open-air animal park near Neuschonau in the Bavarian Forest National Park / Nationalpark Ba...

Silvia Reiche / Forest in autumn, Teutoburger Wald, Germany

Philippe Clement / Family walking along a path in a broadleaf woodland in autumn, Bayerischer Wald / Bavarian Forest National Park, Germany, October 2013.

Philippe Clement / Man and woman with a dog walking along a path in a broadleaf woodland in autumn, Bayerischer Wald / Bavarian Forest National Park, Germany, October 2013.

Philippe Clement / Close up of a European river otter (Lutra lutra) lying on its back grooming its fur, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / Grey wolf (Canis lupus) sleeping in woodland, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / Close up of a European river otter (Lutra lutra) lying on its back, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / European river otter (Lutra lutra) standing on its back legs in a river, looking around, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / European pine marten (Martes martes) emerging from its nest hole in a tree in autumn, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive. Digital composite.

Philippe Clement / Eurasian beaver (Castor fiber) swimming to its lodge, carrying a branch in its mouth, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / European wildcat (Felis silvestris), Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / Black stork (Ciconia nigra), Bayerischer Wald / Bavarian Forest National Park, Germany, October.

Philippe Clement / European brown bear (Ursus arctos arctos) with head underwater looking for fish, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / Black stork (Ciconia nigra), Bayerischer Wald / Bavarian Forest National Park, Germany, October.

Philippe Clement / Lynx (Lynx lynx) sitting in a forest, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive.

Philippe Clement / Black stork (Ciconia nigra) resting with its beak tucked into its chest, Bayerischer Wald / Bavarian Forest National Park, Germany, October.

Philippe Clement / Close up of a Black stork (Ciconia nigra), Bayerischer Wald / Bavarian Forest National Park, Germany, October.

Philippe Clement / Black stork (Ciconia nigra) resting with its beak tucked into its chest, Bayerischer Wald / Bavarian Forest National Park, Germany, October.

Benjamin Barthelemy / Grey Wolf (Canis lupus) on snow. Omega, Germany, Bavarian National Park, February. Captive

Benjamin Barthelemy / Pine marten (Martes martes) emerging from tree hole. Bavarian National Park, Germany, February. Captive

Ingo Arndt / Norway Spruce (Picea abies) trees that have died after being afflicted by bark beetle, Bayrischer Wald National Park, Germany

Ingo Arndt / Norway Spruce (Picea abies) trees that have died after being afflicted by bark beetle, Bayrischer Wald National Park, Germany

Konstantin Mikhailov / European wild cat (Felis silvestris) kitten emerging from undergrowth, Bavarian Forest National Park, Germany, May

Konrad Wothe / Brown Bear (Ursus arctos) mother with cubs, Bavarian Forest National Park, Bavaria, Germany

Konrad Wothe / Wolf (Canis lupus) walking in snow, Bavarian Forest National Park, Bavaria, Germany

Bruno D'Amicis / Young Spruce (Picea abies) growing among dead trees in an area afflicted by Bark Beetle (Curculionidae) infestation. Bayerischer Wald National Park, Germany, May 2010.

Bruno D'Amicis / Dead trees fallen across a stream. Bayerischer Wald National Park, Germany, May.

Bruno D'Amicis / Dead wood and young Spruce (Picea abies) in forest bog. Bayerischer Wald National Park, Germany, May.

Bruno D'Amicis / Dead Spruce (Picea abies) trees in Bark Beetle (Curculionidae) afflicted area on mountain ridge in the Bayerischer Wald National Park. Germany, May 2010.

Bruno D'Amicis / Dead Fir (Abies alba) and Beech (Fagus sylvatica) trees fallen across stream in forest. Bayerischer Wald National Park. Germany, May.

Bruno D'Amicis / Young Beech (Fagus sylvatica) with new foliage in forest. Bayerischer Wald National Park, Germany, May.

Bruno D'Amicis / Pine Marten (Martes martes) among fallen trees in Bayerischer Wald National Park. Germany, May.

Bruno D'Amicis / Ural Owl (Strix uralensis) perching in tree with vole prey. Bayerischer Wald National Park, Germany, May.

Bruno D'Amicis / Ural Owl (Strix uralensis) flying in Beech forest canopy. Bayerischer Wald National Park, Germany, May

Bruno D'Amicis / Bank Vole (Myodes / Clethrionomys glareolus) taking a mouthful of Beech leaves into its burrow. Bayerischer Wald National Park, Germany.

Bruno D'Amicis / Bank Vole (Myodes / Clethrionomys glareolus) gathering a mouthful of Beech leaves. Bayerischer Wald National Park, Germany.

Bruno D'Amicis / Dead Spruce (Picea abies) trees in Bark Beetle (Curculionidae) afflicted area in the Bayerischer Wald National Park at sunset. Germany, May 2010.

Bruno D'Amicis / Dead Spruce (Picea abies) trees in Bark Beetle (Curculionidae) afflicted area in the Bayerischer Wald National Park at sunset. Germany, May 2010.

Bruno D'Amicis / Bank Vole (Myodes / Clethrionomys glareolus) gathering a mouthful of Beech leaves. Bayerischer Wald National Park, Germany.

Bruno D'Amicis / Dead Spruce (Picea abies) trees on Bark Beetle (Curculionidae) affliced mountain ridge in the Bayerischer Wald National Park. Germany, May 2010.

Konrad Wothe / Pine Marten (Martes martes), Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) cubs play-fighting, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) cubs play-fighting, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) mother with cubs in a cave, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) cub investigating bush, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) mother with cub, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / European Beech (Fagus sylvatica) forest, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) female playing with stone in water, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) female scratching its back on a tree, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Wild Cat (Felis silvestris) kitten, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Wild Cat (Felis silvestris) kitten, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Brown Bear (Ursus arctos) mother with cubs, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Gray Wolf (Canis lupus) pair showing aggression, Bayrischer Wald National Park, Bavaria, Germany

Konrad Wothe / Eurasian Lynx (Lynx lynx) in snow, Bayrischer Wald National Park, Bavaria, Germany

Angelo Gandolfi / Brown Bear (Ursus arctos) feeding on tree bark, Bayerisch Wald National Park, Germany, captive

Angelo Gandolfi / Brown Bear (Ursus arctos) in snow, Bayerisch Wald National Park, Germany, captive

Angelo Gandolfi / Brown Bear (Ursus arctos) mock fighting, Bayerisch Wald National Park, Germany. Captive

Konrad Wothe / European Wolf (Canis lupus) pair fighting with one baring teeth, Bavarian Forest National Park, Germany

Konrad Wothe / Common Raven (Corvus corax) with twig in beak, Bavarian Forest National Park, Germany

Konrad Wothe / European Wolf (Canis lupus) walking through snow, Bavarian Forest National Park, Germany

Konrad Wothe / Eurasian Lynx (Lynx lynx) walking through forest, Bavarian Forest National Park, Germany

Konrad Wothe / European Wolf (Canis lupus) in submissive posture, Bavarian Forest National Park, Germany

Konrad Wothe / Eurasian Lynx (Lynx lynx) reclining in snow, Bavarian Forest National Park, Germany

Konrad Wothe / Eurasian Lynx (Lynx lynx) in tree, Bayrischer Wald National Park, Germany

Jouan & Rius / Eurasian lynx (Lynx lynx) walking through snow, captive, Bayerischer Wald / Bavarian Forest National Park, Germany

Jouan & Rius / Three Grey wolves (Canis lupus) in snow, captive, Bayerischer Wald / Bavarian Forest National Park, Germany

Jouan & Rius / Eurasian lynx (Lynx lynx) sitting in snow, captive, Bayerischer Wald / Bavarian Forest National Park, Germany