The Common Brown is a species of butterfly

Butterfly

A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured...

 of the Nymphalidae

Nymphalidae

The Nymphalidae is a family of about 5,000 species of butterflies which are distributed throughout most of the world. These are usually medium sized to large butterflies. Most species have a reduced pair of forelegs and many hold their colourful wings flat when resting. They are also called...

 family, endemic to the southern half of Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. The wingspan

Wingspan

The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is about 60 millimetres (2.4 in) for males and 70 mm (2.8 in) for females.

The larvae feed on Poaceae

Poaceae

The Poaceae is a large and nearly ubiquitous family of flowering plants. Members of this family are commonly called grasses, although the term "grass" is also applied to plants that are not in the Poaceae lineage, including the rushes and sedges...

 species, including Brachypodium distachyon

Brachypodium distachyon

Brachypodium distachyon, commonly called purple false brome, is a grass species native to southern Europe, northern Africa and southwestern Asia east to India. It is related to the major cereal grain species wheat, barley, oats, maize, rice, rye, sorghum, and millet...

, Cynodon dactylon

Cynodon dactylon

Cynodon dactylon , also known as Dūrvā Grass, Bermuda Grass, Dubo, Dog's Tooth Grass, Bahama Grass, Devil's Grass, Couch Grass, Indian Doab, Arugampul, Grama, and Scutch Grass, is a grass native to north and east Africa, Asia and Australia and southern Europe...

, Ehrharta erecta

Ehrharta erecta

Ehrharta erecta is a species of grass also known as panic veldtgrass. The species is native to Southern Africa and Yemen. It is a documented invasive species in the United States, New Zealand, Australia, southern Europe, and China....

, Poa poiformis, Microlaena stipoides

Microlaena stipoides

Microlaena stipoides or Ehrharta stipoides, is a species of grass that occurs naturally in all states of Australia as well as in New Zealand, Papua New Guinea, Indonesia and the Philippines. It has also been introduced into Hawaii and Reunion Island and has been reported as invasive in both...

, Poa tenera and Themeda triandra

Themeda triandra

Themeda triandra is a perennial grass widespread in Africa, Australia, Asia and the Pacific. In Australia it is commonly known as kangaroo grass, in East and South Africa it is known as "red oat grass" or red grass, in Afrikaans, rooigras.The species has a tuffted habit and can reach up to 1.5 m...

. The common brown butterfly is emerging ten days earlier than it did 65 years ago due to the effects of climate change.