The Cape Grassbird or Cape Grass Warbler (Sphenoeacus afer) is an African warbler

Macrosphenidae

The African warblers are a newly erected family, Macrosphenidae, of songbirds. Most of the species were formerly placed in the Old World warbler family Sylviidae, although one species, the Rockrunner, was placed in the babbler family Timaliidae...

 found in southern Africa.

Taxonomy

It was formerly placed in the Sylviidae

Sylviidae

Sylviidae is a family of passerine birds that was part of an assemblage known as the Old World warblers. The family was formerly a wastebin taxon with over 400 species of bird in over 70 genera. The family was poorly defined with many characteristics shared with other families...

 family and is the only member of the genus Sphenoeacus. The taxonomy of the "African warblers", an assemblage of usually species-poor and apparently rather ancient "odd warblers" from Africa is currently in a state of flux.

Description

The Cape Grassbird is 17–19 cm long and weighs around 30 g. Its crown and face sides are rufous, except for white around the eye, and it has black malar and moustachial stripes on its white throat. The upperparts are brown with heavy streaking and the long tail is a lighter brown. The underparts are whitish with blackish spotting. The sexes are similar, but the juvenile has a streaked cap and is duller than the adult. The song is jangling and musical, and the call is a nasal pheeeo.

The long, pointed, straggly tail, chestnut cap and facial stripes are diagnostic of Cape Grassbird. It is much larger than any cisticola

Cisticola

Cisticolas are a genus of very small insectivorous birds formerly classified in the Old World warbler family Sylviidae, but now usually considered to be in the separate family Cisticolidae, along with other southern warbler genera. They are believed to be quite closely related to the swallows and...

, and the heavily streaked back and the pointed tail eliminate confusion with Moustached Grass Warbler.

Distribution and habitat

The Cape Grassbird breeds in southern 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...

, Lesotho

Lesotho

Lesotho , officially the Kingdom of Lesotho, is a landlocked country and enclave, surrounded by the Republic of South Africa. It is just over in size with a population of approximately 2,067,000. Its capital and largest city is Maseru. Lesotho is a member of the Commonwealth of Nations. The name...

, Mozambique

Mozambique

Mozambique, officially the Republic of Mozambique , is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest...

 and Swaziland

Swaziland

Swaziland, officially the Kingdom of Swaziland , and sometimes called Ngwane or Swatini, is a landlocked country in Southern Africa, bordered to the north, south and west by South Africa, and to the east by Mozambique...

 with an isolated population in eastern Zimbabwe

Zimbabwe

Zimbabwe is a landlocked country located in the southern part of the African continent, between the Zambezi and Limpopo rivers. It is bordered by South Africa to the south, Botswana to the southwest, Zambia and a tip of Namibia to the northwest and Mozambique to the east. Zimbabwe has three...

. It is a common species of coastal and mountain fynbos

Fynbos

Fynbos is the natural shrubland or heathland vegetation occurring in a small belt of the Western Cape of South Africa, mainly in winter rainfall coastal and mountainous areas with a Mediterranean climate...

 and long, rank grass on mountain slopes or in river valleys.

Behaviour

The Cape Grassbird builds a cup nest flow in vegetation. This species is monogamous, pairing for life. Its eggs have one of the slowest rates of embryonic development amongst Southern African species. http://www.fitzpatrick.uct.ac.za/docs/lifehist.htm

The Cape Grassbird is usually seen alone or in pairs, moving through vegetation foraging for insects and other small invertebrate

Invertebrate

An invertebrate is an animal without a backbone. The group includes 97% of all animal species – all animals except those in the chordate subphylum Vertebrata .Invertebrates form a paraphyletic group...

s.

Conservation status

This common species has a large range, with an estimated extent of 390,000 km². The population size is believed to be large, and the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e. declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern.