David Pattyn / Great crested grebe (Podiceps cristatus) adult with freshly caught fish. Tench (Tinca tinca) to feed to its young chick, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

David Pattyn / Great white egret (Egretta Alba) preening its feathers, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, July

David Pattyn / Great crested grebe (Podiceps cristatus) adult with young on its back and in the water, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

David Pattyn / Great Spotted Woodpecker (Dendrocopos major) adult male feeding young, Oisterwijk, The Netherlands, June

David Pattyn / Great crested grebe (Podiceps cristatus) adult with young on its back, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

David Pattyn / Great crested grebe (Podiceps cristatus) adults courting and greeting each other to confirm their bond. Even with the young chicks already out they often show courtship behavior to each other, Valkenh...

David Pattyn / Mute swan (cygnus olor) family, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

David Pattyn / Alpine ibex (Capra ibex) adult males fighting in alpine landscape, Valsavarenche, Gran Paradiso National Park, Aosta Valley, Italy, May

David Pattyn / Alpine Ibex (Capra ibex) in its landscape, Valsavarenche, Gran Paradiso national park, Aosta Valley, Italy, May

David Pattyn / Alpine ibex (Capra ibex) struggling in deep snow on a steep slope, Valsavarenche, Gran Paradiso National Park, Aosta Valley, Italy, January

David Pattyn / Bearded vulture (Gypaetus barbatus) in flight over winter landscape with snow, Leukerbad, Vallais, Wallis, Switzerland, January

David Pattyn / Bearded vulture (Gypaetus barbatus) in flight over winter landscape with snow, Leukerbad, Vallais, Wallis, Switzerland, January