Three species of confusingly similar large greyish - olive coloured warblers are now beginning to arrive in Tanzania at this time of year. Some individuals will continue southwards to Zambia, Malawi, Mozambique and even South Africa whilst many will remain in Tanzania for the duration of the boreal winter.
Until recently these three were placed in the genus Hippolais but in the last year, as a result of recent DNA-DNA hybridization research, they have been moved into the genus Acrocephalus.
