Rift. P. m. sundevalli (Fitzinger, 1869) – It occurs in the eastern African coast, and on the islands of Mafia, Pemba and Zanzibar. The red-legged or southern subspecies P. m. anchietae (Bocage, 1879) – The type locality is northern Angola. P. m. bicolor (Gray, 1863) – The range extends from Zanzibar to the KwaZulu Natal region in South Africa. P. m. defriesi (W. Rothschild, 1904) – The type locality is to the west of the steep cliffs in the Muchinga Province (Zambia). P. m. hecki (Matschie, 1897) – Occurs in Malawi, east of the valley of the Luangwa River (Zambia) and northern Mozambique. P. m. monticola (Thunberg, 1789) – Occurs in the Eastern Cape and Western Cape provinces of South Africa. P. m. simpsoni (Thomas, 1910) – Occurs between the lower Congo River and its tributary Kasai River. Description The blue duiker is a small antelope; in fact, it is the smallest duiker. The head-and-body length is typically between . It reaches at the shoulder and weighs nearly . P. m. anchietae is the largest subspecies. Sexually dimorphic, the females are slightly larger than the males. The blue duiker is characterised by a flat forehead, large eyes, small ears with a line of white, large nostrils, a broad mouth and agile lips. The dark tail measures slightly above . A remarkable feature of the tail is the row of white crinkly hairs on either flank that reflect light efficiently, so that when the animal moves its tail up and down, it looks like a luminous signal in the dark habitat. The duiker has short, spiky horns, around long and hidden in hair tufts. A row of minute pores surrounded by a few hairs in the preorbital glands (near the eyes) secrete an opaque liquid consisting of 45 volatile compounds. The pedal glands (near the hooves) produce a pungent, whitish fluid. The subspecies show a great degree of variation in their coloration. The coat can be a shade of blue, grey or brown, and even black. The grey-legged northern subspecies show a grey to brown coloration, with a posterior stripe that marks a transition from the rump to the buttocks. P. m. congicus has a bright grey to black back, with dull grey flanks; a dark brown stripe marks the shift from the black rump to the lighter buttocks. P. m. sundevalli is similar, though the difference between the flanks and