Essex Skipper

Adventure step • Meet the species

Overview

The Essex Skipper (Thymelicus lineola) is a small but fascinating butterfly belonging to the family Hesperiidae, commonly known as the skipper family. This species is renowned for its fast, darting flight pattern and characteristic appearance with orange-yellow wings. The butterfly received its English name when it was first discovered in Essex, England, in 1889, but the species has since spread across much of Europe and parts of Asia. With a wingspan reaching 24-29 millimeters, it is one of the smaller butterflies found in northern regions. One of the most distinctive features of this species is the underside of the antenna tips, which are jet black – a detail that distinguishes it from the very similar Small Skipper (Thymelicus sylvestris), which has orange-brown antenna tips. The wings are orange-yellow to golden-brown on the upper side with darker margins, while males have a distinct black scent-scale brand on the upper side of the forewing. The body is robust and covered with hair, which is typical of the skipper family. The butterfly's large, dark compound eyes give it excellent vision for detecting both floral resources and potential mates. The Essex Skipper undergoes complete metamorphosis (holometabolous development) from egg through larva and pupa to adult butterfly. The larva is green with a darker dorsal line and lives hidden in folded grass blades. It overwinters as an egg in the grass sheath, which is a unique adaptation that distinguishes the species from many other butterflies. The larva feeds primarily on various grass species, particularly Timothy grass (Phleum pratense) and Cock's-foot (Dactylis glomerata). Pupation occurs in a loose silk cocoon among grass stems during early summer. The species has expanded its range dramatically in recent decades, likely as a result of climate change and increased temperatures. In Scandinavia, it is now regularly found in southern Sweden and Denmark, with occasional observations further north. The population is considered stable in most parts of Europe, where the species benefits from meadows, roadsides, and other grass-rich habitats that are not treated with pesticides.