Top 20 Most Common Insects in Finland

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.

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.

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.

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.

The state insect of Montana, mourning cloak (Nymphalis antiopa) owes its name to a visual comparison with a girl who, disliking mourning, allows a few inches of color to show from under her mourning garb. Among the longest-lived butterflies, individuals may persist for as long as eleven to twelve months. It is a powerful flier, with vagrants often found many miles from the usual migration paths.

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.

The wingspan is 28–36 mm. Pattern and colouring are extremely variable. The colour varies from dove grey to dark grey brown, with light brown, light red, reddish-brown to black-brown markings. This has led to the distinction of formae (forms). The apex of the front wing is slightly concave. The head and thorax are coloured mostly according to the wing colour; the abdomen is partially or completely reddish brown. The inner and outer, serrated crossbars are usually darker than the colour and more or less clearly defined. These are often white lined specimens with much darker crossbars. Reniform and orbicular and stains can be as well shown, but also sometimes almost absent. There is always a black dot in the lower part of the reniform. The more or less significant medium shade is darker than the colour and has a strong median bulge. The wavy line is often a series of black dots. The moth flies from September to May depending on the location.

The silver, comma-shaped marked on the butterfly’s wings give it the common name the Comma. It is a common butterfly in southern Britain that was once on the verge of extinction in the 1930s. The butterflies are often found at the edge of forests, close to meadows with plenty of nectar-rich wildflowers.

The wingspan is 35–40 mm. Forewing dull red brown, with slight lilac-grey tinge in places; a distinct black praeapical costal bar; upper stigmata large, with slight pale rings; lower lobe of reniform dark; median shade forming a brown space between the stigmata; a black dot near base of cell; hindwing ochreous or yellowish grey. ab. bajula Stgr. is smaller than the type and suffused with grey, without any red tinge; in the northern form punctata Auriv, the lines are prominently marked by dots on the veins; purpurea Tutt, grisea Tutt and coerulescens Tutt are merely colour variations.

Aphantopus hyperantus is a medium-sized butterfly with a wingspan of up to 3.5 - 4 cm . The wing upper and lower sides are solid brown with small, yellowish-rimmed eyespots. The newly emerged ringlet has a velvety appearance and is almost black with a white fringe to the wings. The number and size of the eyespots is variable, they may be missing on the upper wing surface. The eggs are pale yellow when first laid, but become pale brown.The caterpillars are about 2.5 cm long. They are gray or light reddish brown and have dark, reddish brown and very fine dots. Dorsally there is a dark longitudinal line, which is widened at the segment boundaries. Toward the rear, this line is more intensely colored. The head is darker and has several faint longitudinal stripes.