Figure 4 in Integrative taxonomy reveals unrecognised species diversity in African Corypha larks (Aves: Alaudidae)

Figure 4. Principal component analysis (PCA) based on seven morphometric variables: the lengths of wing, bill, tarsus, tail, hind claw and outermost primary, and the distance from the outermost primary to the wing tip. Ellipses indicate the 68% confidence interval (±1 SD) for each clade. Loadings for each trait, drawn with maps and their relative contributions across all principal components (PCs), can be viewed in the Supporting Information (Fig. S9). Photographs are by Nik Borrow (II, kidepoensis Kidepo National Park, Uganda, May; III, somalica Tuuyo Plains, Somaliland, September; VII, nyikae Nyika National Park, Malawi, December), Maans Booysen, Birding Weto, CC BY-SA 4.0 https:// creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons (VI, malbranti Longa, Angola), Paul F. Donald (Va, pallida, Caprivi Strip, Namibia, November), Emmanuel Barde Elisha (VIII, bamendae Mambilla Plateau, Nigeria), Stratton Hatfield (I, hypermetra Tsavo East National Park, Kenya, March), Peter Steward (IV, athi Nairobi National Park, Kenya, March) and The Trustees of The Natural History Museum, London (II, sharpii NHMUK, identity and collection information lacking). The taxa with photographs are also indicated by '#', and '*' for sharpii.