Hazel Catkins, Bruern, The Cotswolds, United Kingdom

Hazel Catkins, Bruern, The Cotswolds, United Kingdom

Tree lungwort (Lobaria pulmonaria) growing on Hazel (Corylus avellana) Lungwort is an indicator of air pollution as it only grows in clean air. Sutherland, Scotland

New Hazel leaves (Corylus avellana), UK

Hazel Tree Pollen, Sem

Great Spotted Woodpecker (Dendrocopos major) sitting on hazel (Corylus avellana), surrounded by male catkins, Biosphaerengebiet Schwaebische Alb UNESCO Biosphere Reserve, Baden-Wuerttemberg, Germany, Europe

Corylus Avellana, Hazelnut flowers, North Italy, Italy

Corylus Avellana, Hazelnuts, North Italy, Italy

Red squirrel (Sciurus vulgaris) eating a nut in a pond in summer, Moselle, France

Red squirrel (Sciurus vulgaris, grove, Rouesse Vasse, Sarthe, Pays de la Loire, France

Red squirrel (Sciurus vulgaris, grove, Rouesse Vasse, Sarthe, Pays de la Loire, France