While the range of P. r. stenotopicus over the Mainicaland and Mashonaland plateau has been shown by Irwin to be restricted to stands of moist Brachystegia woodland savanna (Miombo ), the ecological backgrounds of the other 4 races are on the whole more expansive in nature. In the case of P. r. diligens Clancey 1979; Andara, Okavango R., northeastern South West Africa/Namibia, this subspecies of the western cinnamonventralled plexus affects the dry woodlands of the Kavango region of Namibia, which constitute the ecotone between the Brachystegia savannas of Angola and Zambia and the Acacia steppe of the South West Arid Zone. In this ecotone, Parus rufiventris diligens and the local race of the Southern Black Tit Parus niger xanthostomus are largely sympatric, this combination probably effected in part by the absence of a local form of the Miombo Grey Tit Parus griseiventris.