Large Emerald, Grande nayade, Miernik zieleniak, Grünes Blatt, Zomervlinder (Geometra papilionaria)
The Large Emerald (Geometra papilionaria), is a moth, the type specimen for the family Geometridae. It is found throughout the Palearctic region and the Near East.
This is a large and attractive species, as the specific name suggests very butterfly like, with a wingspan of 50-65 mm. Newly emerged adults are bright green with darker green and white fascia, though the green colouration fades after a few days. It flies at night from June to August  and is attracted to light.
The larva is brown at first, turning green later, and feeds mainly on birch though it has also been recorded on alder, beech, hazel and rowan. The species overwinters as a larva.