The Marsh Swift is a 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 Hesperiidae family. It is found in tropical Africa

Africa

Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...

. In South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

 it is restricted to the riverine and lowland forests of KwaZulu-Natal

KwaZulu-Natal

KwaZulu-Natal is a province of South Africa. Prior to 1994, the territory now known as KwaZulu-Natal was made up of the province of Natal and the homeland of KwaZulu....

 and swamp areas close to Manguzi Forest, the Pongola River and Kosi Bay in Maputaland

Maputaland

Maputaland is a region of southern Africa situated in the northern part of the province of KwaZulu-Natal, South Africa, and may also refer to the southern-most region of Mozambique. The South African section was also previously known as Tongaland after the Tonga people who live there, and is...

.

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 32–36 mm for males and 36–40 mm for females. Adults are probably on wing year round, but it is more common in autumn and winter in southern Africa.

The larvae probably feed on various 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...

swamp grasses.