Top 20 Most Common Insects in Toulouse

The economically important red Swamp Crayfish is a seasonal seafood staple around the world. It is also called the Louisiana crawfish, an apt name given that the US state produces 90-95% of all harvested specimens. The red Swamp Crayfish is invasive in the EU due to its aggressively spreading populations and competitiveness to native crayfish species. It is also known to cause damage to rice crops from its burrowing habit, which displaces the plants.

Brintesia circe reaches on average wingspan of 65–80 millimetres (2.6–3.1 in). Its wings are mainly black or dark brown. They have a broad white band at the edge of the basal area of all wings and usually a second white streak on the lower wings. The black eyespots on the underside of the upper wings have a white contour. Brintesia circe is quite similar to Hipparchia fagi, but in the latter the second white streak on the lower wings is always missing and the eyespots have a yellow contour. These butterflies usually rest on the branches of a tree, protected by their cryptic markings, but ready to take off and fly away when disturbed.

Colias croceus has a wingspan of 46–54 millimetres (1.8–2.1 in). The upperside of the wings is golden to orange yellow with a broad black margin on all four wings and a black spot near the centre forewing. Usually these butterflies settles with its wings closed, consequently the black margin of the uppersides of the wings is difficultly visible. The underside lacks the black borders and is lighter, with a more greenish tint, particularly on the forewings. In the forewing underside is the same dark spot as on the upperside, but often with a light centre; the hindwing underside has a white centre spot, often with a smaller white or dark dot immediately above it. Sometimes, a row of black dots occurs on the underwings' outer margins, corresponding to where the black border ends on the upperside. Females differ from the males in having yellow spots along the black borders on the upperside. In flight, Colias croceus is easily identifiable by the intense yellow colouring, much brighter than that of the lemon-yellow male common brimstone which also lacks black markings. Like all Colias species they never open their wings at rest. In a small proportion of females (about 5%) the golden upperside colouration is replaced by a pale cream colour. These females have been distinguished as form helice. The pale form helice does not seem to be that distinct as intermediates exist and the variation is to some extent related to humidity during development, with dryer conditions producing paler colouration. These pale forms helice can be confused with Berger's clouded yellow (Colias alfacariensis) and the rarer Pale clouded yellow (Colias hyale). Even the palest C. croceus tends to have more black on the upperside however, in particular on the hindwings. Young caterpillars are yellow-green, with a black head. Later they become completely dark green, with a white red spotted lateral line after the third moult. The pupae are green and have a yellow side stripe. This species is rather similar to Colias myrmidone, Colias chrysotheme, Colias erate, Colias hyale, Colias alfacariensis, Colias caucasica, Colias aurorina.

The painted lady is a migratory butterfly that spends part of the year in Northern Africa and then migrates to Europe during the warmer months. Although the adults feed on nectar from flowers, the larvae feed on the leaves of nettles and thistles.

Its slow and floating flight pattern makes it easy to identify the scarce swallowtail as it soars over gardens, orchards, and scrublands. The butterfly has a large presence across Europe, the Middle East, and Asia. The adult lifespan is brief, only two or three weeks. Planting flowers like blackthorn can encourage the butterfly to visit a garden.

P. megera L. [— xiphie Boisd. pt (45d). Above reddish yellow, with a black mark which traverses the distal band from the cell of the forewing to the abdominal margin of the hindwing, short black stripes crossing the disc and the cell of the forewing.

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.

The orange-spotted emerald is about 53 millimetres (2.1 in) long. It has bright green eyes and a bronzy-green body with yellow spots along the top of the abdomen. The last segment of the abdomen (S10) has a prominent yellow mark on the upper surface.

The silver-washed fritillary (Argynnis paphia) is a beautiful, orange butterfly that is covered in black spots. It earns the "silver-washed" portion of its name through silver streaks you can find running along with it. It produces a scent using "scales" that allows it to distinguish itself when females are trying to locate it.

Large white (Pieris brassicae) is visually similar but quite larger than its close relative P. rapae. It lays its eggs on food plants such as cabbages – the origin of its common name – leading to many farmers' classifying this species as a pest.