Often mistaken for the small cabbage white butterfly, the Green-Veined White is a medium-sized butterfly that's widespread across Europe. You can tell these two butterflies apart from the green veins present on the underwing of the Green-Veined White. These aren't veins, but a mixture of black and yellow-pigmented wing scales. Wing scales are plates on the surfaces of the wings. These reflect different light wavelengths, giving butterfly wings the vivid colour. These insects are attracted to damp, sheltered habitats; such as parks, gardens, meadows, woodland rides and hedgerows.