Top 20 Most Common Insects in Luxembourg

The meadow brown (Maniola jurtina) is similar to the Gatekeeper in the way that it rests with its wings open due to the "eye spots" on either end of its wings that ward off predators. While the color is a deep brown, the caterpillar form is a beautiful bright green with little, white hairs and a dark line leading down its back.

It rests with closed wings when not in flight.

Cabbage white (Pieris rapae) derives its common name from its habits as a caterpillar, which is a ferocious pest for cabbage, kale and broccoli farmers. In North America, it is one of the first butterflies to emerge in spring, heralding the beginning of the season.

European peacock (Aglais io) is a colorful butterfly that resides in temperate Asia and Europe – hence its common name. Its prominent eyespots deter would-be predators, who mistake them for the eyes of a bigger, more dangerous species. In recent years, this species appears to be expanding its range into previously uncolonized territory.

Green-veined white (Pieris napi) is a distinctively white-winged butterfly that lays its eggs in a variety of food plants. This species displays observable differences dependent on sex: males possess only one dark spot on each forewing, whereas females display two. Unlike several of its cousin species, green-veined white prefers not to lay eggs in garden cabbages, rendering it less of a pest to farmers.

Small and colorful, small tortoiseshell (Aglais urticae) is the national butterfly of Denmark. However, it is capable of surviving anywhere the common nettle leaf may be found, which the larvae of this species depend on. Once among the most common butterflies in Europe and temperate Asia, this species is experiencing rapid declines for reasons still being investigated.

Despite its common name, only male specimens of common blue butterfly (Polyommatus icarus) can accurately be described as blue; the females are predominately gray-brown, with only a dusting of blue and a scattering of orange spots. The adults live for only three weeks before dying.

Red admiral (Vanessa atalanta) is a visually striking species of butterfly. Unusually territorial, males will compete for choice areas, and females will only mate with males that maintain their own territories. This butterfly is known for being particularly patient with human interactions, even to the point of perching on clothing or flesh.

Melanargia galathea has a wingspan of 1.8–2.2 in. In these medium-sized butterflies the upper side of the wings is decorated with white and gray-black or dark brown markings, but it is always gray-black or dark brown checkered in the basal and distal areas. The underside is similar to the upper side but the drawings is light gray or light brown. On the underside of the hindwings is present a row of gray eye spots. The males and the females are quite similar, except that some females may have a yellowish nuance on the underside of the wings. The larvae are a lime-green colour, with a dark green line running down the middle of their back. The caterpillars are about 3 cm long. They are green or yellow with some lighter and darker narrow longitudinal lines. The head is always light brown.

Common brimstone (Gonepteryx rhamni) is an attractive species of butterfly; males display iridescence and have yellow wings, whereas females have white-green, non-iridescent wings. This species is wholly reliant on two species of buckthorn plant to lay its eggs. Consequently, the larvae consume large amounts of buckthorn.