Greater Swamp Warbler (Acrocephalus rufescens) [XC434855]
by Bram Piot from Technop\u00f4le, Dakar, Senegal (song)
Greater Swamp Warbler (Acrocephalus rufescens) [XC42873]
by Marcell Claassen from Kabaya Valley Papyrus Swamps, SE Rwanda, Rwanda (song)
Subspecies
Genetic study suggests that this species may form a monophyletic clade with Cape Verde Swamp-Warbler (Acrocephalus brevipennis), Lesser Swamp-Warbler (Acrocephalus gracilirostris), Madagascar Swamp-Warbler (Acrocephalus newtoni), Rodrigues Warbler (Acrocephalus rodericanus) and Seychelles Warbler (Acrocephalus sechellensis) and they are sometimes considered to comprise a separate genus, Calamocichla. Birds from north-western and south-western Uganda, described as respective subspecies niloticus and foxi, considered indistinguishable from ansorgei.
The following 4 subspecies are recognised:
senegalensis Colston & Morel, 1985 - Senegal and Gambia.
rufescens (Sharpe & Bouvier, 1876) - Ghana, southern Togo, southern Benin, Nigeria, Cameroon, Bioko I (Fernandóo Po), northern Central African Republic and north-western DRCongo.
chadensis (Alexander, 1907) - L Chad environs.
ansorgei (Hartert, 1906) - North-western Angola, and southern Sudan south to Uganda, Rwanda and adjacent eastern DRCongo, western Kenya, Zambia, north-eastern Namibia (part of Caprivi Strip), extreme northern Botswana and western Zimbabwe.