Red-Backed Shrikes <i>Lanius collurio </i>Linnaeus, 1758 in Southern Africa

data on migratory birds in their non-breeding grounds are scarce.After ringing and gathering biometric and moult data for more than twenty years in the countries of the southern part of Africa, we are now summarizing our findings.Here, our focus is on the plumage of first-year and adult Red-backed Shrikes Lanius collurio developing during their stay as an aide for the age distinction in the field.We present moult data of both age groups and show moult progression and plumage variation by photographic evidence.