Geometrids 

While at rest, geometers rest with their wings held flat to the surface on which they are resting and have long thin abdomens. Many species appear to look like butterflies. They are typically nocturnal, males with hairy antennae and females without hairs on antannae. Many Geometrids are highly variable in their wing pastterns. Many species are very cryptic and heavily camouflaged with wavy wing patterns. They are also very delicate and if handled, quickly loose their scales and wings tear quite easily. Larvae are known as "inch-worms"