Figure 1 Examples of morphological variation between indigobird species. Nestling mouth markings in V. camerunensis (a) and V. chalybeata (b) mimic the young of their firefinch hosts, L. rara and L. senegala , respectively. Dark wing and plumage in V. chalybeata from West Africa (c). Pale wing and green plumage in V. raricola (d). White bill and blue plumage in V. camerunensis (e). Red bill and orange feet in V. chalybeata from southern Africa (f). See ref. 30 for a complete description of morphological differences between indigobird species.