Figure 1: PhyML maximum likelihood phylogenetic tree of the cytochrome c oxidase subunit 1 gene for waterbuck, impala, reedbuck, oryx, addax, duiker, sheep, goat, nyala, sitatunga, bongo, hartebeest, sassabies, cattle, deer, kudu, wildebeest, eland, bushbuck, and buffalo sequences. Zambian test sequences are shown in capital letters (Supplementary Table  1). Bootstrap values exceeding 75% are shown on the nodes. The deer sequence was used as an outgroup to root the tree. GenBank accession numbers and geographical information are provided in Supplementary Table 1.